# What Is the Ray Peat Diet? By Dr. Benedicte Lerche · Nutrition · Published 2026-09-11 > The Ray Peat diet is a pro‑metabolic eating approach designed to support thyroid function, stabilize blood sugar, reduce stress hormones, and increase cellular energy. Learn the core principles, foods to eat and avoid, and how it can benefit your health. ## What Is the Ray Peat Diet? (Quick Definition) The Ray Peat diet is a pro‑metabolic eating approach designed to support thyroid function, stabilize blood sugar, reduce stress hormones, and increase cellular energy using easy‑to‑digest, nutrient‑rich foods. ## Who Was Dr. Ray Peat? Dr. Ray Peat was an American biologist known for his research on the relationship between nutrition, hormones, metabolism, and aging. He emphasized that optimal thyroid function is the foundation of good health, because thyroid hormones regulate how efficiently the body converts food into usable energy. According to Peat, people with strong thyroid function have: - A higher metabolic rate - Better energy production - Improved resilience to stress - Slower aging processes His work continues to influence the fields of metabolic health, endocrinology, and nutrition. ## What Makes the Ray Peat Diet Unique? The Ray Peat diet is a pro‑metabolic nutritional framework designed to: - Support thyroid function - Boost metabolic rate - Reduce inflammation and hormonal stress — the focus of my [Hormone Optimization™: Progesterone & Pregnenolone Used Safely](/courses/hormone-optimization) course - Improve digestion - Enhance cellular energy production - Promote longevity and healthy weight regulation Unlike many mainstream diets, the Ray Peat approach challenges conventional ideas about "healthy" and "unhealthy" foods. Peat argued that many commonly recommended foods—especially polyunsaturated fats and certain plant foods—can suppress thyroid function and slow metabolism. Instead, he emphasized foods that are easy to digest, nutrient‑rich, and metabolically protective. ## Core Principles of the Ray Peat Diet ### 1\. Prioritizing Thyroid‑Supportive Foods The diet emphasizes foods that: - Provide easily usable energy - Support liver function - Reduce stress hormones - Improve metabolic rate ### 2\. Eliminating Metabolic Suppressors Peat recommended avoiding foods that can slow metabolism, including: - Polyunsaturated fats (PUFAs) - Raw cruciferous vegetables such as cabbage - Legumes, including beans, peas, and lentils - Nuts and seeds - Soy products These foods can interfere with thyroid hormone production and function, thereby directly suppressing your metabolic rate and increasing inflammation. ## Who Can Benefit from the Ray Peat Diet? While the Ray Peat diet is especially helpful for individuals with hypothyroidism, low metabolism, or chronic fatigue, its principles can benefit anyone seeking: - Better energy - Improved digestion - Hormonal balance - Reduced inflammation - Faster metabolic rate - Healthy and lasting weight loss This is not a quick fix—it is a long‑term metabolic strategy that supports deep cellular repair and resilience. ## Saturated Fats vs. Polyunsaturated Fats (PUFAs) Peat strongly advised replacing PUFAs (found in vegetable oils like soy, corn, sunflower, and canola) with saturated fats such as: - Coconut oil - Butter - Dairy fat He explained that PUFAs suppress thyroid function and increase oxidative stress, while saturated fats support metabolic health and hormone production. ## Cholesterol and Thyroid Function High cholesterol is often a sign of low thyroid function, because thyroid hormone is required to convert cholesterol into protective steroid hormones. By improving thyroid function, the Ray Peat diet can naturally help normalize cholesterol levels—without relying on statin medications. ## The Role of Sugar in the Ray Peat Diet One of the most misunderstood aspects of the Ray Peat diet is its emphasis on healthy sugars, especially from: - Ripe fruits - Honey - Orange juice - Milk sugars - Small amounts of white sugar Peat explained that: - The liver needs adequate sugar to activate thyroid hormone - Low blood sugar increases stress hormones - Fasting and low blood sugar suppress metabolism - Small, frequent meals stabilize energy The right carbohydrates are essential for maintaining a high metabolic rate! ## Protein Sources in the Ray Peat Diet Dr. Peat emphasized high‑quality, easy‑to‑digest animal proteins, including: - Dairy - Eggs - Shellfish - Gelatin and collagen - Lean meats such as beef and lamb He recommended avoiding promoted plant proteins such as nuts, beans, and soy because they are harder to digest and contain compounds that can suppress thyroid function. Gelatin, also known as collagen, plays a special role due to its amino acid profile, which balances the inflammatory amino acids found in muscle meats. Therefore, bone broth is recommended on the Ray Peat diet. ## FAQ: Ray Peat Diet ### Is the Ray Peat diet good for hypothyroidism? Yes. The diet focuses on foods that support thyroid hormone production in the thyroid gland, the conversion of T4 to the active thyroid hormone T3, and the cellular response to T3. In my opinion, the Ray Peat diet is an essential part of treating hypothyroidism. ### Does the Ray Peat diet help with weight loss? It can. By improving metabolic rate and reducing stress hormones, many people experience easier fat loss without restriction. ### Why does the Ray Peat diet include sugar? Healthy sugars from fruit, honey, and dairy support liver function and help activate thyroid hormone, and this directly boosts your metabolism. ### Are saturated fats really healthy? According to Ray Peat's research, saturated fats protect the thyroid and reduce inflammation, unlike polyunsaturated fats (PUFAs). ### Is the Ray Peat diet suitable long‑term? Yes. It is designed as a long‑term metabolic strategy, not a temporary diet. ## How to Learn the Ray Peat Diet If you want a clear, structured way to apply Ray Peat's principles, explore my [Pro‑Metabolic Nutrition Course](/courses/metabolic-food-mastery), where I teach the exact framework for restoring thyroid function, stabilizing energy, and building a resilient metabolism. For a deeper scientific foundation, my book [How to Boost Metabolism With Food](/books/how-to-boost-metabolism-with-food) explains the biochemistry behind pro‑metabolic eating and how to use food to support thyroid health. Both resources are designed to help you build a strong metabolic foundation and transform your health through food. ## Frequently Asked Questions ### What is the Ray Peat diet? The Ray Peat diet — also called the pro-metabolic diet or bioenergetic diet — is a nutritional approach developed by American biologist Dr. Raymond Peat. If you want to apply this approach to your own daily life, my book [Healing Metabolism Book Series](/books) is the best starting point, and [How to Boost Metabolism with Food](/books/how-to-boost-metabolism-with-food) goes deeper on the nutritional side. It focuses on foods that support cellular energy production, thyroid function, and hormonal balance, while avoiding foods that suppress metabolism or promote inflammation. ### What foods do you eat on the Ray Peat diet? Core foods include dairy (milk, cheese, Greek yoghurt), ripe fruit and fruit juice, well-cooked root vegetables, eggs, shellfish, liver, white fish, meats such as beef, coffee, and coconut oil. These foods are rich in thyroid-supportive nutrients and easy for cells to burn as energy. ### What foods do you avoid on the Ray Peat diet? The Ray Peat approach avoids polyunsaturated fats (PUFAs) such as vegetable oils, raw cruciferous vegetables, legumes, grains, black tea, excess muscle meat, and processed foods. These foods either suppress thyroid function, burden the liver, or raise stress hormones. ### Is the Ray Peat diet good for hypothyroidism? Yes. The pro-metabolic diet is specifically designed to support thyroid function. By providing the nutrients required for thyroid hormone production and conversion, reducing anti-thyroid foods, and keeping blood sugar stable, it directly addresses many of the root causes of hypothyroidism and sluggish metabolism — a process I guide you through in my book, [How to Boost Metabolism With Food](/books/how-to-boost-metabolism-with-food) ### Is the Ray Peat diet the same as keto or low-carb? No — it is essentially the opposite. The Ray Peat diet emphasises natural sugars and carbohydrates from fruit and dairy as a primary energy source. Dr. Peat was deeply critical of low-carbohydrate diets, arguing they raise cortisol, suppress thyroid function, and impair cellular energy production over time. **Tags:** ray peat diet, pro-metabolic diet, what is ray peat diet, thyroid diet, metabolism foods, PUFAs, saturated fat, pro-metabolic nutrition Source: https://biochemnordic.com/blog/ray-peat-diet