Excess Matters

Tag: serotonin

  • The Craving Cure by Julia Ross: Summary, Key Ideas & Review

    The book in one sentence: A clinical psychologist and nutritional therapy pioneer argues that food cravings are caused by neurotransmitter deficiencies, and that targeted amino acid supplements can stop them, often within 24 hours.

    What Is The Craving Cure About?

    You’ve probably tried the willpower version. You white-knuckle through the afternoon, eat the sad salad, feel proud of yourself for exactly four hours, and then eat a sleeve of crackers at 9 PM. The next morning, you circle back to the same explanation you always land on: something is wrong with you.

    Julia Ross has a different theory. She spent more than thirty years running addiction and eating disorder clinics in the San Francisco Bay Area (over four thousand clients), and what she observed was consistent: cravings are not a failure of character. They are a symptom of measurable brain chemistry deficits. When five key neurotransmitter systems run low, the brain generates involuntary drives toward processed sugar and starch. Not because you’re weak. Because your brain is trying to self-medicate with the only fast-acting chemicals it has access to.

    Ross is also a psychotherapist, which matters for how she argues. She’s not dismissing the emotional dimension of eating. She’s saying that until the brain’s depleted chemistry is restored, no amount of insight, therapy, or resolve will reliably stop the cravings. The sequence she proposes is: fix the brain first, then everything else becomes possible. The Craving Cure is her 432-page clinical manual for how to do that.

    Why Do You Crave? The Neurotransmitter Deficiency Model

    Picture the brain’s appetite regulation as a five-instrument orchestra. When all five are playing well, you eat when you’re hungry, stop when you’re full, and don’t think much about food otherwise. When any one instrument falls out of tune, the result is cravings.

    Ross calls those five systems “the Fabulous Five”: serotonin, blood glucose stability, endorphins, GABA, and the catecholamines (dopamine and norepinephrine). Each system, when depleted, generates a specific and predictable craving pattern. The mechanism isn’t mysterious. Serotonin drops in the afternoon as daylight fades, so Type 1 cravers reliably want carbs at 4 PM. GABA depletes under chronic stress, so Type 4 cravers reach for salty, crunchy foods when they’re overwhelmed. The cravings aren’t random. They’re the brain’s precise, involuntary attempt to restore what’s missing.

    The deeper problem is how processed foods made this worse. Starting in the 1970s, Ross identifies three dietary shifts that simultaneously depleted neurotransmitter-building nutrients and flooded the food supply with substances that exploit the brain’s reward systems: the replacement of animal fats with processed vegetable oils, the explosion of refined sugar and high-fructose corn syrup, and the cultural slide away from animal protein. Before 1970, fewer than a third of Americans were overweight. That’s not nostalgia for Ross. It’s evidence that the current epidemic is caused, not inevitable.

    “Knowing more, willing more, eating less — these strategies are simply no match for the avalanche of pleasure that our Techno-Karbz can trigger in the brain. What else could regularly overwhelm the good intentions of 230 million adults?”

    If 230 million people keep failing at the same task using the same strategies, the strategies are wrong. That’s the whole argument in one move.

    The 5 Craving Types: Which One Are You?

    The Craving-Type Questionnaire (developed over thirty years and twenty thousand amino acid trials) takes about ten minutes and maps your symptom patterns to specific neurotransmitter deficiencies. Most people have more than one type. Here’s what each looks like in practice:

    Type 1: The Depressed Craver (Low Serotonin)

    Cravings hit hardest in the afternoon, evening, and winter. Mood symptoms tag along: negativity, anxiety, worry, perfectionism, insomnia, a low-grade irritability that gets worse as the day goes on. The late-night cereal, the 4 PM chocolate, the “I just need something sweet before I can sleep” (all serotonin). The brain is reaching for carbohydrates because carbs temporarily boost tryptophan’s access to the brain. The amino acid fix is tryptophan or 5-HTP, taken as needed.

    Type 2: The Crashed Craver (Blood Sugar Instability)

    Skip breakfast, feel fine until 10 AM, then raid the office candy bowl like your life depends on it. Or go too long between meals, get shaky and foggy, and make a fast-food decision you’ll regret. This type isn’t technically a neurotransmitter deficiency. It’s a fuel crisis. The brain has no stored glucose and demands a continuous supply. L-glutamine dissolved under the tongue can substitute for glucose in the brain and stop the crash-and-crave episode within minutes.

    Type 3: The Comfort Craver (Low Endorphins)

    This one is about chocolate, creamy textures, doughy foods, and sometimes alcohol. Endorphins are the brain’s endogenous opiates (thousands of times more powerful than morphine at their peak). A University study found M&Ms raised enkephalin activity by 150%, comparable to opium. Ross is not using “addiction” loosely here. The person who says “it’s my one pleasure” and genuinely means it, who feels a small grief at the thought of giving up chocolate, is describing an endorphin deficit. DPA and DLPA work by slowing the enzymes that break down natural endorphins, raising their levels without adding external opioids, without tolerance, without dependence.

    Type 4: The Stressed Craver (Low GABA)

    Chips at the desk. Crackers by the handful. GABA is the brain’s primary inhibitory neurotransmitter, the biochemical antidote to adrenaline. It’s what lets you decompress after a hard day. When it’s depleted by chronic stress and a protein-poor diet, salty, crunchy, starchy foods provide a brief, unsatisfying simulation of the calm the brain is missing. GABA is the fastest-acting of all the interventions: chewed in tablet form (Ross recommends 125 mg), it can produce visible neck and shoulder relaxation within seconds.

    Type 5: The Fatigued Craver (Low Catecholamines)

    Triple espresso people. Energy drink people. “I cannot function without coffee” people. Dopamine and norepinephrine are the brain’s natural stimulants, and when they’re low, food becomes a stimulant delivery system (not comfort or pleasure, but energy). Tyrosine, the direct precursor to the catecholamine family, typically restores energy and focus within five to ten minutes. Ross includes a detailed caffeine withdrawal protocol built around tyrosine replacing the energy effect cup by cup.

    How Amino Acid Therapy Works (and How Fast)

    The protocol has two phases, and the order matters.

    Phase one is the amino acids. You identify your craving type, start the indicated supplements, and within one to seven days (often within hours) the cravings diminish. Ross’s clients consistently report the same thing after their first day: “Amazing. My cravings disappeared.” The mechanism isn’t magic. Amino acids are precursors to neurotransmitters, and the brain can upregulate production relatively quickly once the raw material is available. The speed of response also functions as a diagnostic tool: if the amino doesn’t help, you’ve identified the wrong type.

    Phase two is the food plan. Ross calls it the Primal Plate, a return to pre-1970s eating built around adequate animal protein (the primary dietary source of all five key amino precursors), traditional fats, and the elimination of processed sugar and flour. The food plan is not calorie-restricted. Low-calorie dieting, she argues, starves the brain of protein and deepens neurotransmitter depletion, making cravings worse. Typically, after two to twelve months on the protocol, clients can stop the supplements entirely. The food becomes the chemistry.

    The reason the phases can’t be reversed matters. Attempting to change your diet while your brain chemistry remains depleted guarantees failure. The depleted brain generates cravings stronger than dietary resolve. The amino acids buy time and demonstrate what craving-free life feels like (experientially, not just conceptually). When someone who has blamed themselves for decades feels their food compulsion dissolve within twenty minutes of the right amino acid, the reframe from “willpower failure” to “brain chemistry” becomes something they’ve lived, not just read.

    One honest note on evidence: the amino acid protocols are primarily supported by Ross’s thirty years of clinical observation and the broader neuroscience literature on neurotransmitters, not randomized controlled trials. The clinical mechanism is solid; the RCT base is thin. This is worth knowing before you build a supplement stack around her recommendations.

    Is The Craving Cure Worth Reading?

    Read this if you have cravings that feel genuinely compulsive (not “I’d enjoy a cookie” but “I cannot get through the afternoon without this”), if your cravings follow distinct patterns tied to time of day, season, stress level, or skipped meals, or if you’ve done real psychological work on your relationship with food and found it clarifying but insufficient. The neurotransmitter framework applies to mood and eating simultaneously, which makes it useful for anyone with depression, anxiety, or chronic fatigue sitting alongside their food difficulties.

    Skip it if you have a history of restrictive eating disorders. The elimination of processed foods and the firm categorization of what’s permissible can amplify restriction patterns in ways the book doesn’t adequately address. Ross’s intended audience is compulsive overeaters, not restrictors, and the book doesn’t make that distinction clearly enough. Also skip it if you’re currently working within an intuitive eating framework — food rules and rebuilding interoceptive trust don’t mix well.

    One caveat: the book is 432 pages, and roughly half of that is the dietary framework and recipes rather than the amino acid protocol. The core clinical protocol is in the first 150 pages. The rest is useful if you’re going all-in on the Primal Plate, but don’t let the length put you off the material that matters.

    Books Like The Craving Cure

    BookAuthorBest For
    The End of OvereatingDavid KesslerUnderstanding how the food industry engineered your vulnerability — the external mechanism Ross’s book treats
    The Mood CureJulia RossSame amino acid framework applied to depression, anxiety, and trauma rather than food cravings
    The Hunger HabitJudson BrewerMindfulness-based approach to cravings — different mechanism (reward-based learning), complementary goal
    Bright Line EatingSusan Peirce ThompsonArrives at similar dietary conclusions (eliminate sugar and flour) through behavioral architecture instead of amino acid repair
    The End of CravingMark SchatzkerNutritive mismatch theory — processed food trains the brain to decouple taste from nutrition, creating endless craving

  • Spark by John Ratey: Summary, Key Ideas & Review

    Book in one sentence: A Harvard psychiatrist makes the case in molecular detail that exercise is primarily a brain intervention, not a body one, and that it treats depression, anxiety, ADHD, and addiction as effectively as any drug.

    What Is Spark About?

    Here is what you’ve been told exercise is for: burning calories, toning your arms, lowering your cholesterol, getting your heart rate up. John Ratey spent a career at Harvard Medical School watching those reasons fail to motivate people, and he wrote Spark to offer a different one. Exercise is primarily a brain intervention. The body benefits are real, and they are secondary.

    Ratey is a clinical psychiatrist and associate professor at Harvard Medical School. He spent years synthesizing hundreds of neuroscience studies showing that aerobic exercise directly changes brain structure: growing new neurons, strengthening synapses, flooding the brain with chemicals that rival pharmaceutical antidepressants, and rebuilding the regions most damaged by stress and depression. When you go for a run, you are doing something measurable and structural to the organ that governs your moods, your memory, your impulse control, and your resilience.

    The book opens in Naperville, Illinois, where gym teachers built an intense, heart-rate-based PE program and scheduled it before academic classes. Their students went from average to near the top of international academic rankings (first in the world in science in 1999). The PE teachers didn’t know the molecular reason it worked. Ratey does, and Spark is his explanation.

    Published in 2008, the science has only gotten stronger since.

    What Is BDNF and Why Does It Matter for Your Brain?

    At the center of almost everything Ratey covers is a protein called BDNF (brain-derived neurotrophic factor), which he calls “Miracle-Gro for the brain.” BDNF does for neurons what fertilizer does for plants: it makes them grow, branch out, and form denser connections. It is also the physical substrate of memory. When you learn something and it sticks, BDNF is what made the synaptic connection durable enough to last.

    Aerobic exercise is the most reliable activator of BDNF. A run triggers its release within minutes, then activates the genes that produce more of it over hours and days. Three companion growth factors arrive alongside it (IGF-1, VEGF, and FGF-2), which grow new blood vessels in the brain and support the survival of newly born neurons.

    The hippocampus is where most of this happens. This seahorse-shaped structure deep in the brain governs memory, learning, and emotional regulation. It is also the structure most vulnerable to chronic stress (elevated cortisol literally shrinks it), most affected by depression, and most responsive to exercise. Walking three times per week for six months measurably increases hippocampal volume, reversing roughly two years of age-related brain shrinkage. That is not a metaphor or a motivational claim. It is a finding from Arthur Kramer’s lab at the University of Illinois.

    For years, neuroscience held that adult brains do not grow new neurons. That turned out to be wrong. Fred Gage at the Salk Institute showed that adult brains do generate new hippocampal neurons from stem cells throughout life, and that running mice grow dramatically more of them than sedentary mice. Exercise was building new brain structure.

    The catch: new neurons need stimulation to survive. They are born as blank slates, unusually plastic and primed to form new connections, but they require input to wire into. This is why Ratey frames exercise and mental engagement as a pairing. Exercise provides the raw material; learning or social interaction gives it something to build into. His practical instruction: exercise first, then do the hard cognitive or emotional work within the hour that follows.

    How Does Exercise Treat Depression and Anxiety?

    In 1999, Duke University published a clinical trial comparing aerobic exercise to sertraline (Zoloft) in treating moderate depression. The exercise group matched the medication group in symptom reduction. At the ten-month follow-up, exercisers had lower relapse rates than the medication-alone group. If exercise came in pill form, Ratey notes, it would have been hailed as the blockbuster drug of the century. Instead, the study ran on page fourteen of the Health and Fitness section.

    A follow-up study identified a therapeutic dose: roughly eight calories burned per pound of body weight per week through aerobic exercise. For a 150-pound person, that is about 1,200 calories per week, achievable with six 30-minute sessions. The low-intensity arm (three calories per pound) produced only marginally better results than placebo. Intensity matters. Casual walking is not enough.

    The mechanism matches antidepressants almost exactly. Exercise elevates serotonin, norepinephrine, and dopamine (the same three neurotransmitters that SSRIs and SNRIs target) and does so without pharmaceutical side effects. It also reduces chronically elevated cortisol, which physically damages the hippocampus, and promotes the hippocampal rebuilding that chronic depression tears down.

    “I often tell my patients that the point of exercise is to build and condition the brain.” (John Ratey)

    For anxiety, exercise works through four distinct channels at once:

    • Distraction: the anxious mind gets a different focus, and the post-exercise effect outlasts other distractions
    • Muscle tension reduction: exercise acts like a beta-blocker, releasing physical tension and interrupting the body-to-brain feedback loop
    • Neurochemical rebuilding: serotonin calms the amygdala; GABA (the brain’s natural calming agent, the same target as Valium) rises; BDNF consolidates non-fearful memories
    • Fear relearning: exercise produces the same physical sensations as anxiety (elevated heart rate, faster breathing, warmth), and by associating those sensations with something controllable, the brain gradually relearns that they are not dangerous

    British doctors now use exercise as a first-line treatment for depression. In the United States, as of this writing, it remains vastly underutilized.

    What Does This Mean If You Struggle with Food?

    The case for exercise during weight loss is not about caloric expenditure. This is the part of Spark most relevant to ExcessMatters readers, and most people never hear it framed this way.

    Compulsive overeating and food cravings involve the same reward circuitry as drug and alcohol addiction. The dopamine circuits that govern desire and satisfaction get dysregulated by highly palatable food, flooding the brain with spikes that ordinary life cannot match. Over time, this depletes D2 dopamine receptors (the brain’s receiving end for dopamine signals), leaving the person in a state of chronic reward deficiency. Nothing feels satisfying. Food temporarily fills the gap.

    Exercise addresses this at three levels.

    Immediately. Exercise releases dopamine, providing a natural reward signal that competes directly with cravings. Even a short walk around the block can interrupt a craving cycle by redirecting dopamine and providing a moment of self-efficacy.

    Over weeks. Regular exercise rebuilds depleted D2 dopamine receptors, gradually restoring the brain’s capacity to feel satisfaction from ordinary experience. The pull of compulsive eating weakens as the rest of the world gets richer.

    Structurally. Exercise counteracts the anxiety and depression that most often trigger emotional eating. Ratey’s framing: exercise is not just a substitute behavior for food. It is working on the same underlying neurobiology.

    The Odyssey House drug rehabilitation program in New York built running into their treatment protocol. Their director described what happens when someone quits an addiction: “The drug, for the addict, becomes everything. Take it away and suddenly there is an ’empty vessel’ at the core of the body and mind.” Exercise starts filling that vessel. Residents who ran regularly stayed in treatment twice as long. The “empty vessel” description maps directly onto emotional eating recovery.

    There is also the prefrontal cortex angle. Chronic stress, depression, and emotional dysregulation all impair prefrontal cortex function (the part of the brain that governs impulse control, long-term thinking, and the ability to pause before acting). Exercise directly strengthens prefrontal cortex activity.

    Serotonin, elevated reliably by aerobic exercise, is described in the book as important for “mood, impulse control, and self-esteem.” Those three things cover the emotional terrain of most overeating episodes almost entirely.

    Then there is the stress-eating connection. When cortisol is chronically elevated, the body craves glucose, and simple carbohydrates and fat become irresistible. Exercise breaks the cortisol loop at its source. The comfort food craving loses its urgency when the cortisol driving it gets metabolized instead of accumulated.

    None of this means exercise is magic. It does not directly address the behavioral patterns, the beliefs about food, or the emotional history that often underlies compulsive eating. It gives the brain the neurochemical foundation that makes all of that other work more possible.

    Is Spark Worth Reading?

    Read this if you have ever treated exercise as punishment for eating, used movement to “earn” food, or dismissed exercise as purely a calorie-burning strategy. This book rewires the entire framing. Also essential reading for anyone managing depression, anxiety, or ADHD who has been offered medication as the only option (not because Ratey argues against medication, but because he argues for a fuller toolkit).

    Skip it if you want a step-by-step protocol without the science. Ratey is a gifted communicator, but this is a science book. The final chapter provides a concrete exercise prescription, but the preceding 250 pages are mechanistic explanation. That explanation is the book’s entire point, though not everyone is in the mood to read neuroscience.

    One caveat: Some of the neurogenesis claims (specifically, how robustly adult human brains grow new hippocampal neurons) became more contested after the book’s 2008 publication. The mechanism is real; the magnitude in humans is less settled than Ratey implies. The core argument (that exercise has profound, measurable effects on brain function across every domain he covers) has not been weakened. If anything, the evidence base has deepened.

    Books Like Spark

    BookAuthorBest For
    The Joy of MovementKelly McGonigalWhy movement feels good and how to build an identity around it
    Strong CurvesBret ContrerasPractical strength training program for women
    The Willpower InstinctKelly McGonigalThe neuroscience of impulse control and self-regulation
    The Hungry BrainStephan GuyenetHow the brain drives overeating and what to do about it
    Lean and StrongAllan HillisExercise and nutrition together for body composition