Everything you need to know about ProMetabolic

ProMetabolic is an iOS app built specifically around Dr. Ray Peat's research on metabolism, thyroid health and hormone balance. It's designed for women who are tired of restrictive diets and want to support their thyroid and hormones through nourishment instead.

ProMetabolic is built for women aged 25 to 55 who are dealing with symptoms like chronic fatigue, cold hands and feet, hair thinning, weight stuck despite dieting, brain fog, irregular or missing periods, low libido, and bloating. It's especially useful for women who've tried keto, fasting or low-carb and felt worse.

The principles work for men, but the app is currently designed and tested primarily for women's physiology. Men can absolutely benefit from the food guidance, PUFA tracker and temperature tracking — but cycle-related features won't apply.

Not yet. ProMetabolic is currently iOS only. Android is on the roadmap.

ProMetabolic is built in the United Kingdom by a small independent team. The app is available worldwide on the App Store.

Pro-metabolic eating is a nutrition framework inspired by Dr. Ray Peat that focuses on supporting thyroid function and cellular energy through nourishing foods like ripe fruit, dairy, honey, well-cooked root vegetables, eggs, and saturated fats — rather than restricting calories or carbohydrates.

They're closely related but not identical. The Ray Peat diet refers to the specific food principles Peat advocated. Pro-metabolic eating is the broader framework that includes Peat's work alongside research from Dr. Broda Barnes, Weston A. Price, and modern endocrinology. ProMetabolic is grounded in Peat's principles but applies them practically.

Core pro-metabolic foods include ripe fruit, fresh-squeezed juice, whole dairy (milk, cheese, yoghurt, butter), well-cooked root vegetables (potato, carrot, beet), quality protein (eggs, shellfish, slow-cooked meats), honey, gelatin, coconut oil, and white rice. The emphasis is on foods that fuel the thyroid and lower stress hormones.

Pro-metabolic eating minimises polyunsaturated fats (PUFAs) including most seed and vegetable oils (sunflower, canola, soybean, corn), nuts and nut butters in large quantities, fatty fish like salmon, and processed foods rich in industrial oils. Raw cruciferous vegetables, raw leafy greens in large amounts, and undercooked starches are also typically reduced.

Yes, in Peat's framework. Whole milk provides calcium, high-quality protein, fat-soluble vitamins, and saturated fat — all supportive of thyroid hormone conversion. Modern wellness culture has demonised dairy as 'inflammatory' but the evidence for this in healthy adults is weak. The exception is anyone with a genuine dairy allergy or lactose intolerance.

Yes, the right kinds. Pro-metabolic eating supports sugar from ripe fruit, fresh-squeezed juice, honey, and lactose in dairy. These provide rapid liver glycogen refill which supports T3 conversion and lowers cortisol. It does not advocate refined sugar in packaged processed foods. Quality matters.

Start by adding pro-metabolic foods in rather than cutting things out. A glass of whole milk at breakfast, ripe fruit through the day, butter on your vegetables, honey in your coffee. Track your morning temperature. Be patient — meaningful metabolic recovery typically takes 3 to 6 months. Download the free starter guide on the homepage for a deeper introduction.

Dr. Raymond Peat (1936-2022) was an American biologist with a PhD in physiology who spent over 40 years researching hormones, metabolism and nutrition. He published extensively on thyroid function, oestrogen, progesterone and cellular energy, and influenced a generation of practitioners toward a pro-sugar, anti-PUFA, pro-thyroid approach to health.

PUFA stands for polyunsaturated fatty acids — found in seed oils, nuts, seeds, and fatty fish. Ray Peat's research linked excess PUFA intake to thyroid suppression (PUFAs block T4 to T3 conversion), cellular oxidation, and inflammation. The pro-metabolic guideline is to keep daily PUFA intake under approximately 4 grams. The ProMetabolic app tracks this automatically.

Basal body temperature (BBT) is your body temperature taken first thing in the morning before getting out of bed. It's one of the oldest and most accurate biomarkers of thyroid function. A consistent waking temperature below 36.5°C / 97.8°F often indicates a sluggish metabolism. Watching your morning temperature rise over weeks is one of the clearest signals that your thyroid is healing.

For many people, yes — particularly women. Your thyroid needs glucose to convert T4 (storage hormone) into active T3. Long-term keto suppresses this conversion, raises reverse T3, and lowers metabolic rate. Common symptoms include cold extremities, hair thinning, fatigue, and missing periods.

It can. Prolonged or daily fasting raises cortisol and lowers T3, shifting the body into a stress state. Hair growth is deprioritised when the body senses scarcity. Women are particularly vulnerable because their reproductive system is highly responsive to perceived food shortage signals.

ProMetabolic includes an AI pro-metabolic coach, a 7-day personalised meal planner, a food checker that rates any food on pro-metabolic principles, a PUFA tracker that scans USDA-verified foods, a basal body temperature (BBT) logger, 50+ pro-metabolic recipes, and daily metabolic tips.

Yes. The AI coach is trained on pro-metabolic principles and Ray Peat's research. You can ask about specific foods, symptoms, supplements, recipes, or how to handle situations like eating out or travelling. The coach is designed to feel like a pro-metabolic nutritionist in your pocket.

No. ProMetabolic provides nutrition information based on the research of Ray Peat, Broda Barnes and others. It is not a replacement for medical advice. Always consult a qualified healthcare provider for medical decisions, especially if you have a diagnosed thyroid or hormone condition or are taking medication.

Noom and MyFitnessPal focus on calorie counting and weight loss. ProMetabolic does not count calories or focus on weight loss. Instead it focuses on thyroid health, hormone balance, and metabolic recovery through nourishment. It's a fundamentally different philosophy — adding nourishing foods rather than restricting calories.

Cronometer is a detailed micronutrient and macro tracker. ProMetabolic tracks the specific things that matter for thyroid and hormone health — like PUFA intake and basal body temperature — and provides AI guidance grounded in Ray Peat's research. Cronometer is a tracker; ProMetabolic is a coach plus a tracker for a specific philosophy.

ProMetabolic is explicitly opposed to intermittent fasting for most women, especially premenopausal women with hormone or thyroid issues. Where Zero and Simple help you fast longer, ProMetabolic helps you eat consistently throughout the day to support your thyroid and stress hormones.

Yes. ProMetabolic is free to download and use. A Pro subscription unlocks advanced features like the AI coach with unlimited messages, personalised meal planning, the full recipe library, and PUFA tracking. The Pro subscription includes a free trial.

Pricing is shown in the app when you sign up. The Pro subscription has both monthly and annual options, with a free trial. Subscriptions are managed through your Apple ID and can be cancelled at any time via your iPhone settings.

Subscriptions are managed through Apple. To cancel: iPhone Settings → tap your Apple ID at the top → Subscriptions → tap ProMetabolic → Cancel Subscription. Cancellation takes effect at the end of your current billing period.

Yes. In the app, go to Settings → Account → Delete Account. This permanently removes your data, including your profile, conversation history, temperature logs and saved recipes.

Pro-metabolic eating is generally considered safe and supportive during pregnancy and breastfeeding because it emphasises nourishment over restriction. However, you should always consult your obstetrician or midwife before making significant dietary changes during pregnancy.

Email hello@prometabolic.io. We aim to respond within 48 hours on weekdays.