Metabolic Food Mastery™

The Metabolism You Want To Build

A plain-language introduction to metabolism, the thyroid, and the cellular energy state that decides how you feel every day. By the end of this module you will know what a pro-metabolic diet is for, and why food is the most powerful daily lever you have.

Testing Your Metabolic Rate

Before we change a single thing about your food, you need a way to measure where you are. In this module, you learn to read the signs your body is already giving you, and to use pulse and temperature as a daily window into your thyroid function.

Introduction to the Ray Peat Diet

A clear map of Doctor Ray Peat's pro-metabolic way of eating — what it removes, what it leans into, and the rhythm of a balanced day — before we go deep into each food group in the phases ahead.

The Hidden Danger of Polyunsaturated Fats (PUFAs)

Polyunsaturated vegetable oils are the most metabolism-suppressing food in the modern diet. In this module, you learn what they are, the simple refrigerator test that reveals them, and why Doctor Peat warned against them so strongly.

How PUFAs Damage the Body Over Time

Polyunsaturated fats accumulate in the body fat for years and quietly drive obesity, inflammation, premature aging, and the cholesterol confusion that has shaped fifty years of mistaken nutritional advice. This module shows you how, and what to expect as your body slowly clears them.

The Healing Saturated Fats (and a Word on Olive Oil)

Coconut oil, butter, ghee, beef tallow, cream, and full-fat milk are stable, anti-inflammatory, and protective. This module walks you through each one — how to choose it, how to use it, and where extra-virgin olive oil sensibly fits in.

The Cholesterol Myth and Saturated Fats

Why cholesterol is a life-essential molecule rather than a harmful one, why polyunsaturated oils lower cholesterol by exerting toxicity, and why a high cholesterol reading is most often a symptom of low thyroid function. The fifty-year campaign that built the cholesterol myth, what cholesterol actually does in the body, why statins are dangerous, and how a strong metabolism is the only safe way to lower cholesterol.

Why Carbohydrates Are the Heart of Metabolism

Carbohydrates are present in honey, table sugar, fruits, vegetables, rice, pasta, bread, breakfast cereals, and dairy products. In this module, you learn why the liver needs a steady supply of glucose to convert the inactive thyroid hormone T4 into the active hormone T3 — and why low-carbohydrate diets quietly decrease T3 production.

Sugar and Fruit — Rehabilitating the Most Demonised Foods

Many health professionals link sugar consumption to obesity, type 2 diabetes, and yeast overgrowth. Dr. Peat did not share these concerns. In this module, you learn why fructose stabilises blood sugar and stimulates metabolism, why polyunsaturated fats — not sugar — cause type 2 diabetes, and why honey, white sugar, and sweet fruit have a place in a healthy diet.

Starches — Where Carbohydrates Become a Problem

Rice, bread, pasta, and cereal are rich in starch — long chains of glucose molecules. In this module, you learn why starches overstimulate insulin, lower blood sugar below normal, and promote obesity, why whole grains are concentrated sources of polyunsaturated fat, and why slow-risen sourdough and Masa Harina tortillas are the safer choices.

Vegetables — Why They Must Be Cooked

Raw vegetables from the cabbage family inhibit thyroid function. In this module, you learn why Dr. Peat advised against undercooked vegetables and salads, why cabbage-family vegetables must be thoroughly boiled to neutralise their goitrogens, why raw carrots are the one exception, and how Dr. Ray Peat’s carrot salad supports gut health and hormonal balance.

Why Protein Matters — The Foundation of T3 and a Steady Metabolism

Without enough high-quality protein, the liver cannot convert T4 into T3, oestrogen and endotoxins are not cleared, and thyroid medication often stops working. In this module, you learn how much protein you actually need, and why quality matters as much as quantity.

Low-Quality Protein — Why Beans, Lentils, Soy, Nuts and Seeds Suppress the Thyroid

Beans, lentils, soy, nuts, almonds, and seeds are promoted as healthy plant proteins, but Doctor Peat showed they suppress thyroid function through three different mechanisms — phytoestrogens, polyunsaturated fats, and indigestible fibre.

High-Quality Animal Protein — Milk, Cheese, Eggs, Shellfish, White Fish, Ruminant Meat, Liver, and Gelatin

Doctor Peat built his protein recommendations around dairy, eggs, shellfish, white fish, ruminant meat, liver, and gelatin. In this module, you learn how much of each, why low-fat dairy has a special role, and why gelatin must accompany muscle meat.

Veganism, Vegetarianism, and the Ray Peat Diet

Whether the Ray Peat diet can be followed by a vegan or a vegetarian — and where each path runs into trouble with protein, calcium, and parathyroid balance. A vegetarian version is easier and in some ways advantageous; a fully vegan version is doable if it is built around potatoes and mushrooms, but requires significant volume.

The Two Plant Proteins That Work — White Potatoes and White Button Mushrooms

Doctor Peat recognised only two plant proteins as comparable to animal protein: well-cooked white potatoes and well-cooked white button mushrooms. In this module, you learn the precise way to prepare each one and why no other plant protein takes their place.

Calcium, Parathyroid Hormone, and Why Dairy Heals the Metabolism

Calcium does far more than build bones. In this module, you learn how a low-calcium diet drives parathyroid hormone up, suppresses cellular respiration, calcifies the soft tissues, and slows the metabolism — and why 1500 to 2000 mg of dietary calcium a day, mostly from dairy, is one of the most powerful pro-metabolic interventions in this whole course.

Salt — Are You Getting Enough?

Why the standard advice to restrict salt is exactly the wrong instruction on a slow metabolism — and why salting your food to taste is one of the simplest pro-metabolic moves you can make.

Beverages — Water, Coffee, and Tea

Why the popular instruction to drink eight glasses of water a day can be actively harmful on a slow metabolism, and why Dr. Peat regarded coffee and tea as nutritious beverages rather than something to avoid.

Alcoholic Drinks

Why most alcoholic beverages are quietly estrogenic — beer in particular — and the safer choices Dr. Peat recommended when alcohol is consumed at all. Includes a downloadable Good & Bad Beverages reference for the whole phase.

Spices, Flavour, and Why Your Food Must Taste Good

Why pleasure at the table is not a luxury but a metabolic signal — and which natural spices are safe and supportive on a pro-metabolic diet.

Pure Protein and Pure Starch — Why Eating Either One Alone Crashes Blood Sugar

Pure protein eaten alone and pure starch eaten alone do almost the same thing to your blood sugar — both overstimulate insulin, both end in a crash, and both quietly lower the metabolic rate over time. The fix is the simple act of always pairing.

The Pro-Metabolic Meal — Combining Carbohydrate, Protein, and Saturated Fat

A pro-metabolic plate combines good carbohydrate, good protein, and good saturated fat. The exact ratio is forgiving; the presence of all three is what counts.

Building a Pro-Metabolic Breakfast, Lunch, and Dinner

Examples of pro-metabolic breakfasts, lunches, and dinners drawn directly from my meal guide: coffee with milk and sugar or fructose, orange juice with hydrolysed gelatine, eggs in any form balanced with fruit, the morning smoothie, Greek yogurt with fruit, Doctor Peat's Masa pancake, cheese and fruit; egg-and-vegetable omelette, feta or mozzarella salad, wild shrimp salad, Masa Harina tortillas; ruminant meat or cod with potatoes or low-starch vegetables, cheese with basil and tomato, omelette, well-cooked potato with butter and salt, and the weekly coconut-milk shellfish dish.

Snacks, Frequent Eating, and the Bedtime Meal

Why frequent small balanced snacks beat intermittent fasting every time, and why a small meal before bed is one of the most powerful changes you can make.

Weight Loss on the Ray Peat Diet

How to lose weight on the pro-metabolic diet without lowering your metabolic rate — leaning on low-fat dairy, lean proteins like eggs, shellfish, and gelatin, sweet low-starch fruit, the daily raw carrot salad, and coconut oil instead of butter, eaten as frequent small balanced meals so the rate stays up while the weight comes down.

Balance of Health and Disease

Doctor Peat's larger picture of health as biological energy and disease as the imbalance between energy resources and environmental demands — T3 as the central regulator, the transition from low-energy to high-energy state, and what the next layers of the work look like when diet alone is not enough: T4 plus T3 in a three-to-one ratio, progesterone, pregnenolone, supplements, probiotics, and light therapy. A long-term commitment to optimal health, not a quick fix.