u/EternalVoyage

It is Tim Ferriss’s Slow-Carb Diet. Here is the comparison:

Carbohydrates and Fructose

Ferriss: Banned six days a week. All fruits, juices, and simple sugars are eliminated because fructose is viewed as an unnecessary trigger for blood sugar fluctuations and hepatic fat storage.

Peat: Core foundation of the diet. Simple sugars from orange juice, ripe fruit, honey, and white sugar are actively encouraged to restore liver glycogen, suppress stress hormones like cortisol and adrenaline, and drive the active thyroid hormone T3.

Legumes and Fiber

Ferriss: Mandatory staple. Lentils, black beans, and pinto beans are required at nearly every meal to supply slow-digesting, low-glycemic calories and sustain satiety.

Peat: Strictly avoided. Complex starches and non-digestible legume fibers are considered harmful because they feed fermentative gut bacteria, raising systemic endotoxins and triggering metabolic inflammation.

Dairy and Minerals

Ferriss: Prohibited completely, with the exception of butter. Dairy is excluded primarily due to its insulin response and potential to stall fat loss.

Peat: Primary dietary component. Whole or skim milk and cheese are consumed daily to ensure a high calcium-to-phosphorus ratio, which helps lower parathyroid hormone and maintain metabolic speed.

Proteins and Fats

Ferriss: Emphasizes high-volume muscle meats (chicken breast, beef, egg whites) and allows standard cooking oils without explicitly restricting polyunsaturated fats.

Peat: Restricts pure muscle meats to prevent excess tryptophan and cysteine, prioritizing gelatinous cuts, bone broth, and organ meats. Unsaturated vegetable oils (PUFAs) are strictly forbidden due to their thyroid-suppressing and pro-inflammatory properties, favoring saturated fats like butter and coconut oil

I was a strict carnivore with ~%75 of my calories from fat. I have low thyroid function and high cortisol so I began to modify my diet according to Ray Pete principles. I increased my carb intake to %10 and my cortisol seems to be on the decline. I drink orange juice and eat honey before bed also began to increase my calcium and glycine intake. I am planning to increase carbs to %20 max.

If my energy levels are good and my stress is on the decline what would I lose if I continue to eat high fat low carb with just %20 from carbs?

I eat a lot of muscle meat. If I take powdered glycine with every meal is that enough?

I asked several AIs here is the answer (I am pasting one as others are similar)

Rough macro breakdowns from ethnographic/nutritional studies of these traditional diets (percentages are of total calories, and vary by season/source):

**Inuit (traditional, pre-Western contact)**

- Protein: ~35-40%

- Fat: ~50-55%

- Carbs: ~5-10%

- Based on seal, whale, fish, caribou. Very low plant intake; ketogenic-ish, but high protein rather than pure fat-based keto.

**Hadza (Tanzania, hunter-gatherers)**

- Carbs: ~40-45% (tubers, baobab, honey — often the single biggest calorie source seasonally)

- Fat: ~20-25%

- Protein: ~25-30%

- Highly seasonal — honey can spike to 15-20% of calories alone in some months; meat intake varies a lot by hunting success.

**Maasai (traditional, pastoralist)**

- Fat: ~60-70% (mostly from milk, meat, and historically blood)

- Protein: ~20%

- Carbs: ~10-15% (nearly all from milk sugar/lactose)

- One of the highest-fat traditional diets studied, yet historically low incidence of cardiovascular disease in field observations — a much-discussed anomaly.

**Mongolian (traditional, pastoralist/nomadic)**

- Fat: ~35-40%

- Protein: ~20-25%

- Carbs: ~35-40% (dairy products, some grain/millet, seasonal produce in modern diets)

- More dairy-diverse than Maasai (fermented mare's milk, cheese, yogurt), somewhat more carb from processed dairy sugars and grain than Inuit/Maasai.

**Overall spectrum**

Maasai and Inuit sit at the high-fat, low-carb end (just different protein levels); Hadza sits closest to a carb-forward diet due to tuber/honey reliance; Mongolian is the most balanced across all three macros of the four.

Caveats: none of these are single fixed numbers — they shift by season, hunting/herding success, and which study you're pulling from (Inuit estimates in particular range depending on whether it's Stefansson-era observation or modern isotope-based reconstruction).

I am on a strict carnivore diet but thinking of modifying my diet because of high cortisol and low thyroid function. One thing I love about my diet is that my Testosterone is on the upper end of the range and estradiol on the lower end.

So what are your testosterone and estradiol levels on Ray Pete diet?

I was on keto diet for 3 years and after that I have been on strict carnivore for the last 3 years.

I am 180cm (~5.91 ft) , 77kg (170lbs) male.

I eat 800grams (1.76 lbs) of raw 80/20 ground beef a day with 40 grams (1.41 oz) of butter. I used to eat less ground beef with more butter but I was the same back then. I also eat 1 oz of frozen beef liver everyday.

I gradually increased my water and salt intake now I am drinking ~2lt water and getting 12 grams of salt. I take 2,5mg of Mg citrate powder (~400mg of elemental Magnesium). I used to take extra potassium too but it didn't make any difference.

I do a high intensity training once a week called Body by Science workout (based on Mike Mentzer's principles). I also walk a lot.

I love this diet especially having high testosterone and low estrogen. I don't want to give up this diet but I have almost all of the symptoms of high cortisol and low thyoid function. I have a lot of visceral fat, close to times when I was eating junk food. I also have low blood pressure. Lately I was experimenting with adding carbs (~75 grams from raw honey and orange juice) before bed as a result in the morning my anxiety lessened a lot.

What am I doing wrong? How can I correct high cortisol and low thyroid function?

I have been on strict ketogenic carnivore diet for 3 years. I have high cortisol and almost all of the symptoms of hipothyroidism.

Someone recommended me Ray Pete. I made a little research about him through AI. What he says makes sense. I still eat a lot of meat. I eat 800gr 80/20 ground beef and 40gr of butter a day. But I modified my diet a little and added 500ml pasteurized milk, 500ml organic orange juice and 25gr raw honey.

It has been one month since I added carbs. I measure my stress levels and heart rate variability through my garmin watch but they didn't improve yet.

I don't want to lower my fat intake because currently my testosterone levels are high, my estrogen is very low and I like it that way.

So what do you recommend me to decrease my cortisol, improve low thyroid symptoms but still keep the testosterone high and estrogen low?

Last time I got tested my e2 level was <13 and the normal lower range was >10 so it was 11 or 12.

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For me the most noticable effects was becoming less emotional. One exception is anger.