Excess Matters

Tag: cycle syncing

  • Eat Like a Girl by Mindy Pelz: Review, Key Ideas & Notable Quotes

    Why This Book Matters

    Most diet advice was designed for men and adjusted for women as an afterthought. The calorie-counting framework, the idea that weight loss is purely a math problem of intake versus output — these were built on metabolic models developed in mostly male research populations, then applied to female bodies that operate on a fundamentally different clock. Women’s bodies are not running on a stable 24-hour metabolic rhythm. They are running on a monthly hormonal cycle that changes what the body needs, how it processes food, and what it stores or burns — every single week.

    Eat Like a Girl is Dr. Mindy Pelz’s case for eating in sync with that cycle. It is the companion volume to her earlier Fast Like a Girl, which established a fasting framework mapped to the menstrual cycle. Where the first book addressed when to eat, this one addresses what to eat — and specifically how food choices should shift based on which hormones are dominant at any given phase. The book’s most important contribution is not any specific food list. It is the reframe: the symptoms women have been told to push through or medicate — the pre-period carbohydrate craving, the post-ovulation bloating, the perimenopausal sleeplessness and weight gain — are not personal failures or inevitable aging. They are hormonal signals pointing toward specific, addressable imbalances.

    Pelz is a chiropractor by training, not an endocrinologist, and that matters when evaluating her scientific claims. But the practical framework she has developed over years of clinical work and an enormous online community of women experimenting with these ideas is genuinely useful, even where the underlying mechanisms are more contested than she acknowledges.

    Core Framework

    The Hormonal Hierarchy

    Pelz organizes hormonal function around a cascade she calls the Hormonal Hierarchy. At the top is oxytocin — the safety, connection, and bonding hormone. Oxytocin suppresses cortisol. Cortisol, when chronically elevated, drives insulin resistance. Insulin resistance disrupts the sex hormones: estrogen, progesterone, and testosterone.

    The practical implication is that any dietary approach that tries to balance sex hormones while ignoring blood sugar and cortisol is treating downstream effects rather than root causes. A woman eating perfectly by macro standards but sleeping five hours a night, working in a high-stress environment, and skipping meals — her cortisol spike from that lifestyle will overwhelm whatever food choices she makes. The hierarchy gives her a framework for understanding why her “clean diet” is not producing the results she expects.

    Blood sugar is the most actionable lever in the hierarchy, and Pelz’s shift away from calorie counting toward glycemic impact is one of the book’s most useful reframes. Every food choice that creates a large glucose spike triggers a compensatory insulin surge. Repetition of those surges leads to insulin resistance. Insulin resistance deranges sex hormone production. Tracking glycemic impact rather than calories changes the entire decision framework — and it produces meaningful metabolic improvements for most women even before cycle syncing is introduced.

    The Fasting Cycle: Four Phases, Two Eating Styles

    The book’s structural core is the Fasting Cycle — a map of the menstrual cycle divided into four phases, each with its own fasting window and eating style.

    Power Phase 1 (Days 1–10): Hormones are low and estrogen is building. The body can tolerate longer fasting windows — 13 to 72 hours — without the cortisol spike suppressing hormonal activity. Eating style: ketobiotic (under 50 grams net carbs from whole plant sources, 75+ grams protein, healthy fats at every meal).

    Manifestation Phase (Days 11–15 / ovulation): Estrogen, testosterone, and a pulse of progesterone all peak simultaneously. This is Pelz’s highest-hormone moment — the time when fasting should be shortest (13–15 hours maximum) to avoid cortisol interference. Eating style: hormone feasting (150+ grams carbs from whole-food sources, emphasis on diverse proteins for full amino acid coverage).

    Power Phase 2 (Days 16–19): Post-ovulation, hormones dip before progesterone rises. The body can return to longer fasting windows. Eating style: ketobiotic, with added emphasis on foods that support estrogen detox — bitter greens, cruciferous vegetables, fermented foods.

    Nurture Phase (Days 20 through the first day of the next period): Progesterone peaks. Progesterone is a calm, restorative hormone, but it requires a low-cortisol environment to do its work. Fasting during this phase raises cortisol and suppresses progesterone. Pelz’s instruction: no fasting, hormone feasting. Carbohydrate cravings during this phase are a hormonal signal, not a willpower failure.

    For women who do not cycle — due to menopause, surgical intervention, hormonal contraception, or cycle loss — Pelz maps the same framework to the moon cycle: new moon as Day 1, full moon as Day 14.

    Key Ideas

    Carb Cravings Are Hormonal Communication

    This is the reframe that stops many women cold the first time they encounter it. The intense desire for carbohydrates in the week before menstruation is not a character flaw. It is progesterone’s way of telling the body it needs more glucose. Progesterone is a hormone that requires carbohydrates to peak appropriately, and the body’s craving is a request — specific, physiologically grounded, and meaningful.

    The relevant question, Pelz argues, is not whether to honor the craving but how. Processed carbohydrates — cookies, crackers, bread — satisfy the craving chemically while delivering excitotoxins (MSG, aspartame, artificial additives) that raise cortisol and directly suppress progesterone. Whole-food carbohydrates — sweet potatoes, bananas, root vegetables, dark chocolate above 70 percent cacao — satisfy the same hormonal need without the cortisol spike. The difference in outcome for a woman’s pre-period experience can be substantial.

    For anyone who has spent years treating their pre-period hunger as a problem to be controlled rather than a signal to be answered intelligently, this reframe is genuinely disorienting in the best possible way.

    The Estrobolome: Why Gut Health Is a Hormonal Issue

    The estrobolome is the specific community of gut bacteria whose job is to break down estrogen and convert it into a format usable by cells. Without a healthy estrobolome, estrogen cannot be metabolized efficiently — and unmetabolized estrogen is stored as fat, particularly in the belly and breast tissue. This connection between gut bacteria and hormonal symptom load is one of the book’s most scientifically grounded sections and one of the most underappreciated ideas in women’s health writing.

    The estrobolome is depleted by a familiar list of modern factors: antibiotics (in medications and food), birth control pills, alcohol, highly processed diets, and environmental pollutants. This means that many of the hormonal symptoms women attribute to “estrogen dominance” or “low estrogen” may actually reflect impaired estrogen metabolism — a problem addressable through the gut rather than through prescription hormones.

    Pelz’s rebuild protocol is the Three Ps: probiotics (raw fermented yogurt, kefir, sauerkraut, kimchi, miso, tempeh), prebiotics (garlic, onions, leeks, asparagus, dandelion greens, flaxseed, chicory root), and polyphenols (dark chocolate, berries, cloves, green tea, olives, flaxseed meal, artichokes). The three categories work synergistically: probiotics introduce new beneficial strains, prebiotics feed and strengthen existing bacteria, and polyphenols specifically regrow the hormone-metabolizing strains of the estrobolome.

    Ketobiotic Eating: Modified Keto That Keeps the Plants

    Pelz’s ketobiotic approach is worth distinguishing from conventional ketogenic diets, because it departs from keto in the one way that matters most for long-term adherence and hormonal health. Standard keto eliminates or severely restricts all carbohydrates, including from vegetables and fruit. Ketobiotic keeps net carbohydrates at or below 50 grams per day but draws all of those carbohydrates from whole plant sources: leafy greens, cruciferous vegetables, berries, kiwi, cantaloupe, avocado.

    The practical difference is substantial. A ketobiotic plate is built around vegetables with protein and healthy fat — not around bacon and cheese. The fiber and phytonutrients in those vegetables directly support the estrobolome (Rule 2) and the liver’s hormone detoxification function (Rule 3). A conventional ketogenic diet, despite producing insulin sensitivity improvements, can deplete the gut microbiome and impair estrogen metabolism if it is not also rich in plant foods.

    Pelz’s protein target of 75 grams minimum per day — scaling up to 1 gram per pound of ideal body weight for muscle building — is consistent with emerging research on protein requirements for women, particularly perimenopausal and post-menopausal women at risk of muscle loss. More muscle means more insulin receptor sites, better glucose utilization, and reduced fat storage. This is one of the areas where the book’s guidance aligns well with mainstream evidence.

    Alcohol and the Menopausal Liver

    Pelz makes a point about alcohol that is clinically important and not often stated directly enough: alcohol temporarily halts the liver’s ability to metabolize hormones. Not impairs — halts. While the liver is processing alcohol as the toxin it is, it is not breaking down estrogen, progesterone, cortisol, or thyroid hormones. Once the alcohol is cleared, it resumes. The problem is the timing.

    For perimenopausal women already experiencing declining progesterone and rising anxiety, the nightly glass of wine to take the edge off is almost certainly making the underlying hormonal situation worse. The anxiolytic effect of the alcohol is real and short-term. The suppression of hormone metabolism during the liver’s detox window, night after night, compounds the very anxiety it is being used to address. Pelz’s suggested maximum for perimenopausal and post-menopausal women is two drinks per week. For many of the women this book targets, that number is substantially lower than their current intake.

    Menopause as Navigation, Not Deficiency

    The book’s most valuable section for its primary audience is the chapter on menopause and the guidance for women who no longer cycle. Rather than framing menopause as a hormone deficiency requiring replacement, Pelz frames it as a navigation challenge: the body is shifting its primary hormone production site from the ovaries to the adrenal glands, and symptoms reflect how well or poorly that transition is supported by lifestyle.

    The symptom-mapping framework is specifically useful: hot flashes, night sweats, vaginal dryness, cognitive changes, and bone loss indicate declining estradiol and call for more ketobiotic days. Insomnia, anxiety, breast tenderness, increased hunger, and difficulty fasting indicate declining progesterone and call for more hormone feasting days and less fasting. For a post-menopausal woman whose symptoms shift week to week, this gives her a decision framework that is responsive to what her body is signaling rather than fixed to a protocol designed for a body that no longer applies.

    Notable Quotes

    “Your hormones are not a negative part of your humanness; they are your superpowers. The fact that you can be happy one moment, then crying the next is part of your authentic feminine nature. Your hormonal landscape is intricate and sophisticated.” — Chapter 7

    One of the book’s most direct challenges to the cultural framing of hormonal variability as pathology. Pelz is making a structural argument: emotional range is hormonal information, not disorder.

    “One reason so many women are experiencing a dysregulation in their metabolic systems is because they’ve been trained to count calories to lose weight. A low-calorie diet can still create mayhem in your metabolic system. Focusing on blood sugar puts not only your metabolic system back into harmony but it can also calm a raging nervous system and regulate even the craziest of hormonal challenges.” — Chapter 1

    The foundational reframe. Caloric deficit is insufficient as a metabolic model for women because it ignores the hormonal cascade triggered by blood sugar spikes.

    “Belly fat is a huge burden for many women, especially menopausal women… Perhaps the worst part about belly fat is that you can’t diet or exercise your way out of it. That’s because this is one of the areas where your body stores all the excess hormones it can’t metabolize and detox out of you, especially cortisol and estrogen.” — Chapter 3

    This repositions belly fat as a hormone storage and metabolism problem rather than a caloric surplus problem — which changes both the intervention and the self-blame calculus for women who have tried everything and not moved it.

    “When you drink, you temporarily halt your liver’s ability to metabolize hormones. Once your liver has cleared the alcohol, it will go back to the business of breaking down hormones. Where I see this challenging women the most is during their perimenopausal years.” — Chapter 3

    A clinically useful point that is rarely stated this directly in popular health writing. The nightly glass of wine is not a neutral coping tool for hormonal anxiety — it is actively compounding the problem.

    “The carbohydrate cravings many women experience during the Nurture Phase are not a failure of willpower. They are a hormonal signal that your body needs more glucose and a wider range of amino acids to support rising progesterone.” — Chapter 8

    The single most useful reframe in the book for the specific experience of pre-period hunger. The craving is not a character problem. It is a hormonal request.

    “If you learn to eat like a girl — in a way that helps you produce, metabolize, and detox your hormones — you will find yourself living in a body you love.” — Chapter 3

    The book’s organizing promise. Worth holding alongside the critical note: for women with access to a cycle, specific food sensitivities, and the capacity to track and experiment, this promise is meaningfully achievable. It is overstated as a universal outcome.

    “The estrobolome is the specific community of gut bacteria whose job is to break down estrogen. Without these key microbes, estrogen can’t get reformatted for cellular use.” — Chapter 3

    The concept that most readers will not have encountered before and that has the most immediate practical implications — particularly for women who have had significant antibiotic exposure, years on oral contraceptives, or a history of highly processed eating.

    Who Should Read This

    This book is most useful for cycling women between roughly 30 and 55 who have already tried conventional dietary approaches and found them inadequate — women whose bodies seem to behave unpredictably in ways that calorie counting does not explain, and who want a framework that accounts for the monthly variation they are actually experiencing.

    It is particularly well-suited for perimenopausal women (roughly ages 40–55) who are dealing with new or worsening symptoms — weight gain that will not move, sleep disruption, anxiety, mood volatility, brain fog — and who want a lifestyle-based framework to explore before or alongside conversations with a healthcare provider about hormone therapy.

    Women on hormonal contraceptives will find the book less immediately applicable, since their natural cycle is suppressed, though Pelz’s general nutritional principles and food quality guidance are valuable regardless of cycle status.

    Women primarily dealing with disordered eating, binge eating, or a history of restriction-driven cycles should approach this book with caution. The framework is not designed for these dynamics, and the emphasis on food quality, fasting, and phase-based restriction could compound existing difficulties without the right support in place. The books in this library better suited to that work include Intuitive Eating, Breaking Free from Emotional Eating, and The DBT Solution for Emotional Eating.

    Related Books

    • Fast Like a Girl — Mindy Pelz: The companion volume on when to eat and fast across the cycle. Essential reading alongside this one; the two books form a complete framework.
    • Intuitive Eating — Evelyn Tribole and Elyse Resch (review on ExcessMatters): The framework most in tension with Pelz’s structured approach. For women whose relationship with food involves restriction history, intuitive eating principles are a necessary counterweight to any protocol-based system.
    • Eat, Drink, and Be Healthy — Walter Willett (review on ExcessMatters): More rigorous evidence base for nutritional guidance. A useful companion for readers who want the research foundation under Pelz’s recommendations.
    • Bright Line Eating — Susan Peirce Thompson (review on ExcessMatters): Another structured eating framework that also dismisses calorie counting in favor of a metabolic reframe. Thompson addresses food addiction neuroscience; Pelz addresses hormonal rhythm.
    • Breaking Free from Emotional Eating — Geneen Roth (review on ExcessMatters): For readers whose primary relationship with the pre-period carbohydrate craving is emotional and shame-based rather than physiological, Roth is the more important starting point.

  • Fast Like a Girl by Mindy Pelz: Review, Key Ideas & Notable Quotes

    Why This Book Matters

    If you’ve ever tried intermittent fasting and made things worse — weight wouldn’t move, periods got irregular, anxiety spiked, hair came out in clumps — you are not broken, and you were not doing it wrong in some personal failure kind of way. You were doing it wrong in the way that everyone was doing it wrong, because the fasting protocols that became popular were designed around research conducted primarily on men.

    Mindy Pelz spent years watching this play out in her practice and on her YouTube channel, where hundreds of thousands of women were testing fasting advice designed for male hormonal patterns and then blaming themselves when it backfired. Her response was Fast Like a Girl — a women-specific fasting framework built around the core biological fact that women’s hormones don’t operate on a 24-hour cycle. They operate on a monthly one.

    This book is not a diet book, and Pelz is explicit about that distinction from the first chapter. Fasting, as she frames it, is a biological tool — a way of triggering specific healing processes inside the body by controlling the timing of eating rather than the content of it. What she adds that almost nobody in the mainstream fasting conversation had articulated clearly before: the timing question is not the same for all women at all times of the month. When you eat matters, but when in your cycle you eat matters just as much.

    For women who have struggled with food, body, and metabolism — and who have quietly wondered why the advice that works for everyone else consistently fails them — this book provides a structural explanation that has nothing to do with willpower.

    The Core Framework: Fasting Synced to Your Hormonal Cycle

    The book’s central concept is what Pelz calls the Fasting Cycle — a system for matching fasting length and eating style to the hormonal phase of the menstrual cycle.

    She divides the cycle into three phases:

    The Power Phase (Days 1–10 and 16–19): Estrogen and other sex hormones are at their lowest points during these windows. This is when fasting is most beneficial and best tolerated. The body uses fasting to clean up damaged cells (autophagy), shift into fat-burning mode (ketosis), and support the natural rise of estrogen that prefers a low-insulin environment. Pelz recommends the full range of fasting lengths during this phase — anywhere from 13 to 72 hours depending on the specific goal.

    The Manifestation Phase (Days 11–15): Estrogen and testosterone peak around ovulation. Fasting should be kept at 15 hours or under. Longer fasts during this window create a dangerous overlap: estrogen surges release stored toxins from tissues, and autophagy (triggered by 17+ hour fasts) releases additional toxins from dying cells. Both happening simultaneously produces what Pelz calls a double detox — nausea, brain fog, anxiety, hair loss, heart palpitations. This is why some women feel terrible when they fast “correctly” by the conventional 16:8 standard. They are fasting during ovulation.

    The Nurture Phase (Day 20 through the start of the next period): No fasting. Progesterone dominates during this phase, and progesterone requires two things to synthesize properly: low cortisol and adequate glucose. Fasting elevates cortisol. Low-carb eating keeps glucose too low. Doing either during this phase actively depletes progesterone — the hormone responsible for calm, sleep, cycle regularity, and emotional stability. Women who have been fasting and eating low-carb in the week before their period and wondering why their PMS is getting worse now have an answer.

    For women without a cycle — postmenopausal, on hormonal birth control, or with irregular periods — Pelz provides the 30-Day Fasting Reset, which runs all three phases over 30 days regardless of cycle presence. It’s the same hormonal logic applied to a calendar, not a biological cycle.

    Key Ideas

    The Failed Five: What Diets Actually Did to Your Body

    Before Pelz introduces fasting, she explains why conventional diets made things harder. She calls them the “Failed Five”:

    1. Calorie restriction — every time you eat less and exercise more, you raise cortisol, which spikes insulin, which suppresses estrogen and progesterone. The calorie deficit that’s supposed to fix your weight is suppressing the hormones that regulate your metabolism.
    2. Poor food quality — industrial seed oils (canola, soybean, vegetable), refined sugars, and environmental chemicals (obesogens, endocrine disruptors) dysregulate hormonal signaling at the cellular level.
    3. Chronic cortisol — overtraining, high-stress lifestyles, and aggressive fasting during progesterone-dominant phases keep cortisol chronically elevated, which sits directly upstream of every sex hormone problem women experience.
    4. Toxic load — roughly 1,000 endocrine-disrupting chemicals in the modern environment interfere with the hormone receptors on cells; phthalates (plastics, commercial fragrances) are particularly destructive to testosterone and progesterone production.
    5. One-size-fits-all — the male-derived, calendar-agnostic approach that has dominated diet culture ignores the monthly hormonal rhythm that governs every metabolic process in a woman’s body.

    This framing is empathetic and useful because it relocates the failure from the woman to the protocol. If you’ve tried and struggled, this chapter may be the one you’ve needed to read for a decade.

    The Six Fasting Lengths: Not All Fasts Are the Same

    One of the book’s most genuinely useful contributions is the taxonom of six fasting lengths, each triggering different biological effects:

    • 12–16 hours (Intermittent Fasting): Improves blood sugar, blood pressure, gut microbiome diversity, and insulin sensitivity. Entry-level — the metabolic baseline.
    • 17–72 hours (Autophagy Fasting): Triggers cellular self-cleaning. Dr. Yoshinori Ohsumi won the 2016 Nobel Prize in Physiology or Medicine for discovering that in the absence of food, cells eat their own damaged parts — organelles, proteins, oxidized particles — rather than getting weaker. Autophagy repairs the cells surrounding the ovaries (relevant for PCOS and fertility), neurons in the brain (memory, mood, neurodegeneration), and immune cells.
    • 24+ hours (Gut-Reset Fast): The first length to release stem cells into the gut’s mucosal lining. Particularly useful after antibiotics, hormonal birth control use, or for gut-related conditions.
    • 36+ hours (Fat-Burner Fast): Forces the liver to release stored glycogen. Used specifically for women with weight-loss resistance who have plateaued on shorter fasts.
    • 48+ hours (Dopamine-Reset Fast): Repairs and sensitizes dopamine receptors. Effects emerge in the weeks following the fast — reduced compulsive behavior, improved mood, greater sense of contentment.
    • 72 hours (Immune-Reset Fast): Triggers stem cell regeneration of white blood cells. Dr. Valter Longo’s research on chemotherapy patients showed that a three-day water fast causes old, depleted white blood cells to die off and a new population to form. It is a literal immune system reboot.

    For women who have been treating “intermittent fasting” as a binary practice — either doing it or not — this spectrum changes the picture entirely. Different lengths address different conditions. The choice of how long to fast is a clinical decision, not just a willpower one.

    The Hormonal Hierarchy: Why Stress Undoes Everything

    Pelz maps a cascading hormonal relationship that explains why the most health-conscious, high-achieving women are often the ones whose hormones are most disrupted:

    Oxytocin → Cortisol → Insulin → Sex Hormones

    Cortisol, spiked by stress, overtraining, poor sleep, and — critically — fasting at the wrong phase, triggers insulin secretion. Elevated insulin then suppresses estrogen and progesterone. A woman can be following a technically correct fasting schedule and still see no hormonal improvement if cortisol is chronically elevated.

    The top of the hierarchy is oxytocin — the bonding hormone produced by hugging, laughing, meaningful conversation, petting animals, meditation, yoga, sex, and genuine connection. Oxytocin directly calms cortisol. This makes the “soft” stuff — rest, pleasure, social connection — physiologically upstream of every hormonal outcome. For the overextended woman who responds to her health problems by adding more discipline and restriction, this is the structural argument that the approach itself is the problem.

    What to Eat: Ketobiotic vs. Hormone Feasting

    Pelz builds two distinct eating modes around the fasting cycle.

    Ketobiotic eating (Power Phase): Modified keto designed for women. Maximum 50 grams net carbs daily (from vegetables, not grains), maximum 75 grams protein (to prevent the gluconeogenesis pathway from spiking blood sugar and blocking ketosis), and 60+ percent of calories from healthy fats. The 75-gram protein ceiling surprises many women who’ve been told to maximize protein. Pelz is firm: for women in ketosis, the ceiling matters more than the floor.

    Hormone feasting (Manifestation and Nurture Phases): Up to 150 grams of complex carbohydrates from whole-food sources — sweet potatoes, lentils, black beans, squash, wild rice, tropical fruits, berries. These carbohydrates are not a dietary concession; they are the physiological substrate progesterone requires to synthesize. The woman who eats strict keto all month and wonders why her period is late and her pre-period anxiety is unbearable has been removing the very ingredient her body needs for hormonal stability.

    Notable Quotes

    On why universal fasting advice fails women:

    “While the scientific evidence is clear that fasting heals, there still exists one huge blind spot: A one-size-fits-all approach to fasting doesn’t work, especially for women.”

    This is the thesis in a sentence. The evidence for fasting is solid. The failure is in applying it without regard for the monthly hormonal context that governs how women’s bodies respond.

    On reframing fasting from deprivation to healing:

    “Fasting is not like any other diet. It is not a moment of deprivation; it’s a gift you give yourself that will allow your body and brain to recover from the stressors of the modern world.”

    This reframe matters for anyone whose relationship with food has involved a lot of restriction-and-punishment cycles. Pelz is positioning fasting as a self-care practice, not a control mechanism.

    On the cellular science:

    “Dr. Yoshinori Ohsumi’s landmark research revealed that in the absence of food our cells get stronger, not weaker. Instead of looking for nutrients outside the cell when food is scarce, that cell turns within and eats what’s inside.”

    The Nobel Prize framing is the book’s most effective credibility move. The image of cells cleaning themselves in the absence of food is visceral, and it genuinely represents the science.

    On what happens when women get the protocol right:

    “If there is anything that these women have taught me, it’s that once a woman knows how to build a fasting lifestyle around her cycle, she becomes unstoppable.”

    Pelz’s clinical enthusiasm is real, and earned from watching hundreds of thousands of people apply this framework.

    On the hormonal hierarchy:

    “The hormone oxytocin can calm cortisol. Cortisol spikes will cause increases in insulin, and surges in insulin have a direct effect over your sex hormones estrogen, progesterone, and testosterone.”

    This chain — and the implication that generating oxytocin through rest, pleasure, and connection is a hormonal intervention — is the book’s most counterintuitive and practically useful claim.

    On what diet culture actually did:

    “Most diets have blindly disconnected you from your body’s design, leading you straight into the arms of frustration, self-doubt, and distrust with your body.”

    For anyone who has spent years failing at advice that was never designed for their biology, this lands hard.

    On the necessity of carbohydrates before menstruation:

    “If estrogen thrives when insulin is low, progesterone thrives when cortisol is low. There is a precursor steroid hormone called DHEA that you need to make progesterone. If during this phase of your monthly cycle your cortisol spikes too much, you won’t have enough DHEA to make progesterone.”

    This passage explains, in plain biological terms, why the strictest dieters often have the worst PMS.

    Who Should Read This

    Read this if you:

    • Have tried intermittent fasting and experienced adverse effects — hair loss, worsening anxiety, disrupted cycles, no weight loss despite consistent effort
    • Are perimenopausal or postmenopausal and want a structured way to use fasting without worsening hormonal symptoms
    • Are experiencing PMS, irregular cycles, or hormonal weight gain that hasn’t responded to conventional diet advice
    • Have been living in chronic stress and want to understand how that stress is directly suppressing your hormones
    • Are already fasting and want to understand why you’ve plateaued

    You can skip this if you:

    • Have a history of disordered eating or restriction — the fasting framework here is developed enough that it warrants working through with a therapist or dietitian before self-applying
    • Are looking for clinical evidence at research-paper rigor; Pelz synthesizes well but extends beyond the published evidence base in places
    • Are a man, or are not interested in the hormonal-cycle framing (though the metabolic switching and autophagy science applies universally)

    A note of caution: Pelz is a chiropractor, not an endocrinologist, and some of her specific claims — particularly around toxic load and estrogen detox — are more speculative than the fasting science she builds her framework on. The core cycle-syncing logic is sound. The more specific mechanistic claims benefit from additional scrutiny. If you are managing thyroid conditions, type 2 diabetes, or adrenal fatigue, involve a physician before applying the condition-specific protocols in Appendix C.

    Related Books

    • The Obesity Code — Jason Fung: The foundational text on insulin and fasting; provides the scientific underpinning for Pelz’s metabolic framework and is more clinically rigorous on the insulin-weight connection.
    • In the Flo — Alisa Vitti: Cycle-syncing framework for food, exercise, and lifestyle; covers similar hormonal phase territory with more emphasis on living cyclically rather than therapeutic fasting specifically.
    • Glucose Revolution — Jessie Inchauspé: Blood sugar management and glucose spike reduction; complements Pelz’s insulin-estrogen model with practical tools for flattening glucose curves during the eating window.
    • Breaking Free from Emotional Eating — Geneen Roth: Important companion for anyone whose relationship with food involves restriction cycles; the hormonal explanation for food behaviors pairs well with Roth’s psychological framework.
    • The Hormone Cure — Sara Gottfried, M.D.: More clinically rigorous treatment of estrogen, progesterone, and cortisol imbalances; useful counterpoint for readers who want the endocrinology to go deeper than Pelz takes it.

  • The Happy Hormone Guide by Shannon Leparski: Summary, Key Ideas & Review

    Book in one sentence: A plant-based blogger’s practical system for balancing hormones through cycle syncing, seed cycling, and daily lifestyle changes. Accessible entry-level, but light on clinical evidence.

    What Is The Happy Hormone Guide About?

    Shannon Leparski spent her teens and early twenties cycling through the same miserable loop: severe PMS, jawline acne, mood swings bad enough to frighten her parents, and periods so irregular she went 42 days between them. Doctors offered her the pill. Dermatologists offered her harsh medication. Nobody offered her an explanation for why her body was behaving this way.

    She found one eventually, not through the medical system but through a book. Reading Alisa Vitti’s Woman Code triggered what Leparski describes as a complete reorientation of how she understood her own body. Over the next few years, she rebuilt her cycle from scratch using food, lifestyle changes, and phase-specific routines, and documented what worked in her vegan food blog, The Glowing Fridge. The Happy Hormone Guide is that documentation turned into a book.

    Leparski is a holistic health coach and wellness writer, not a clinician. She is transparent about this throughout. The book is organized around what she calls the Happy Hormone Method, a four-part framework covering blood sugar stability, toxin reduction, gut health and estrogen clearance, and cycle-synced living. Two distinctive tools run throughout it: seed cycling (rotating specific seeds across the two halves of the menstrual cycle to support estrogen and progesterone) and adaptogens (herbs like ashwagandha, maca, and reishi used for stress and symptom support). Both are wellness-world staples. The evidence behind them ranges from reasonable to thin, and Leparski does not oversell it.

    What Is Seed Cycling and Does It Actually Work?

    Seed cycling is the practice this book is most associated with, and the one most worth examining before you decide whether to read further.

    The theory: The menstrual cycle divides into two halves with different hormonal priorities. In the first half (days 1-14, menstrual and follicular phases), rising estrogen is the dominant force. In the second half (days 15-28, ovulatory and luteal phases), progesterone takes over. Seed cycling uses four seeds to support each half:

    • Days 1-14: Flaxseeds and pumpkin seeds. Flax contains phytoestrogens and lignans that support estrogen production while helping clear excess estrogen. Pumpkin seeds are high in zinc, which Leparski says “helps prime and support the production of adequate progesterone in the next phase.”
    • Days 15-28: Sesame seeds and sunflower seeds. Sesame contains lignans that modulate estrogen and magnesium for cramp relief. Sunflower seeds are rich in selenium to support liver detoxification of hormones.

    The honest picture: Seed cycling has a following in wellness circles and an origin in traditional herbalism. What it does not have is robust RCT-level evidence. The proposed mechanisms are plausible, flaxseed lignans do influence estrogen metabolism, and omega-3s from pumpkin and flax have anti-inflammatory properties. But whether rotating seeds on a specific schedule produces measurable hormonal changes in healthy women has not been rigorously tested. One small 2023 study found no significant effect on cycle regularity. Leparski cites the Herbal Academy and a lignans-breast cancer study, not clinical trials on seed cycling itself.

    Worth doing? Probably harmless, and possibly useful as a habit anchor that keeps you eating seeds consistently. Worth treating as a proven protocol? Not yet.

    How Does Cycle Syncing Work in Practice?

    Cycle syncing, the broader framework Leparski builds seed cycling into, has stronger physiological grounding even if the phase-specific prescriptions stay somewhat ahead of the research.

    The four phases of the menstrual cycle genuinely do produce different hormonal environments, and those environments do create real differences in energy, metabolism, recovery capacity, and mood. Leparski structures the book’s second half around a seasonal metaphor: menstrual phase as winter, follicular as spring, ovulatory as summer, luteal as autumn. Each phase chapter covers food recommendations, exercise type and intensity, skin changes, and social energy.

    The most practically useful phase guidance covers the luteal phase (days 15-28), when progesterone rises and PMS symptoms accumulate for women whose hormonal balance is off. Leparski’s recommendations for this phase are specific and well-reasoned:

    • Eat complex carbohydrates (sweet potato, oats, brown rice) to support serotonin production and reduce cravings in the days before menstruation
    • Prioritize magnesium-rich foods (pumpkin seeds, dark leafy greens, dark chocolate) for sleep and PMS reduction
    • Reduce or eliminate high-intensity cardio in the late luteal phase, because it spikes cortisol at the exact moment the body needs progesterone to dominate
    • Use sesame and sunflower seeds from the seed cycling rotation

    For the follicular phase (days 6-13), she highlights rising estrogen’s effect on serotonin and dopamine, making it the natural window for new projects, harder workouts, and social energy. The ovulatory phase (days 14-17) gets the endorsement for maximum-intensity training. The menstrual phase gets a clear prescription: rest, warmth, iron and zinc replenishment, gentle movement only.

    The framework requires cycle tracking as a prerequisite. Leparski covers apps (Kindara, MyFLO, Flo), basal body temperature charting, and dedicated monitors. Women on hormonal birth control do not experience the four-phase cycle, so the phase-specific recommendations do not apply while on it.

    What Else Does Leparski Cover?

    Adaptogens for stress and symptoms. Chapter 5 introduces adaptogens as herbs that “adapt to whatever your body needs help with at the time.” Ashwagandha and maca appear in her ovulation and amenorrhea support list. Reishi appears for period cramps. Rhodiola and DIM (diindolylmethane) appear for severe PMS. These are framed as symptom-specific additions after the core protocol is in place, not replacements for it.

    Blood sugar as the master lever. Leparski identifies unstable blood sugar as the most consistently overlooked driver of hormonal symptoms. Glucose spikes trigger insulin responses; insulin resistance creates a cortisol response; sustained cortisol suppresses ovulation. The practical fix is structural: protein, fat, and fiber at every meal, no carbohydrates eaten alone, no skipped meals, caffeine after food rather than before. Straightforward, applicable immediately.

    The gut-estrogen connection. The estrobolome, the subset of gut bacteria that metabolize estrogen, gets a full explanation here. When bowel transit is slow or the microbiome is imbalanced, estrogen the liver has already processed for excretion gets reactivated and returned to circulation. The result is estrogen dominance: heavy clotty periods, breast tenderness, jawline acne. Cruciferous vegetables (broccoli, cauliflower, Brussels sprouts, kale) contain DIM, which supports the liver’s estrogen detoxification. Daily fiber, fermented foods, and hydration support the rest.

    Endocrine-disrupting chemicals. Chapter 2 walks through the average woman’s daily chemical exposure, more than 100 synthetic compounds before leaving the house, and focuses the practical guidance on reducing the highest-absorption products first: deodorant and body lotion (left on skin all day), then cleaning products, then food containers. The EWG Skin Deep database is her recommended audit tool. One category per month.

    Reading your period as data. One of the book’s most distinctive contributions is a short guide to interpreting menstrual blood characteristics. Bright cranberry red blood: balanced. Dark purple-eggplant blood: excess estrogen. Very light pink: possible low estrogen. Clots: probable estrogen dominance or impaired clearance. Brown spotting before the first heavy day: often low progesterone from an anovulatory cycle. A free monthly feedback mechanism that updates faster than lab work.

    Is The Happy Hormone Guide Worth Reading?

    Read this if you are already plant-based (or vegan) and want hormone-specific guidance that works within those constraints, most hormone books ignore plant-based eaters entirely. Also worth it if you are new to cycle syncing and want an accessible, organized entry point before moving to denser clinical books.

    Skip it if you have already worked through Woman Code or In the FLO by Alisa Vitti, Leparski credits Vitti openly as her primary source and the conceptual overlap is substantial. Also skip it if you have active clinical conditions (PCOS, endometriosis, clinical hypothyroidism) that need more than lifestyle guidance.

    One caveat: The seed cycling evidence is limited, mostly traditional and mechanistic rather than RCT-tested, and the book’s clinical rigor overall sits at the lower end of the hormone books on this site. Leparski is honest about her non-clinical background and consistently directs readers toward naturopathic and medical practitioners for diagnosis. That transparency earns trust. Still, women who want clinical depth should read Aviva Romm’s Hormone Intelligence alongside this one, not instead of it.

    The book is a good fit as a gentle first book for women who suspect their symptoms are not inevitable, have not yet dug into the cycle syncing literature, and want practical food and lifestyle guidance they can start immediately. Women already deep in functional medicine territory will find limited new material here.

    Books Like The Happy Hormone Guide

    BookAuthorBest For
    Happy HormonesLara Briden / Nat KringoudisNatural approaches to hormone health with more clinical grounding
    Healthy HormonesSamantha KirkpatrickPractical hormone nutrition with stronger evidence base
    In the FLOAlisa VittiLeparski’s primary source, deeper on the Cycle Syncing Method
    Hormone IntelligenceAviva Romm, MDClinician-authored, stronger on PCOS, endo, and thyroid; best companion read
    Eat Like a GirlMindy PelzCycle-aware eating for women navigating perimenopause and metabolic shifts