# Thermogenesis

Category: Metabolism

Also known as: heat production, thermogenic

Thermogenesis is the biological production of heat, fundamentally tied to the rate of mitochondrial oxidative metabolism and a direct indicator of an organism's energy status. Ray Peat consistently framed thermogenesis not as a wasteful byproduct but as the central expression…

9 passages · 3 authors · 2007–2023 · Most-cited: [Ray Peat](https://bioenergeticoracle.com/md/voices/ray-peat/index.md)

Canonical page: https://bioenergeticoracle.com/concepts/thermogenesis

## Synthesis

**Thermogenesis** is the biological production of heat, fundamentally tied to the rate of mitochondrial oxidative metabolism and a direct indicator of an organism's energy status. [Source 3, 6] Ray Peat consistently framed thermogenesis not as a wasteful byproduct but as the central expression of *efficient energy production*, arguing that a high metabolic rate and correspondingly warm body temperature are essential for resisting the degenerative processes of aging. [Source 1, 3] He rejected the "rate of living" theory that posited mitochondrial respiration as a source of damaging free radicals, instead identifying the suppression of energy production—and the consequent drop in temperature—as the true driver of pathology. [Source 3]

The primary endogenous regulators of thermogenesis are **thyroid hormone** and **progesterone**, both of which directly increase metabolic rate and body temperature while opposing catabolic, hypothermic signals. [Source 2] Peat documented how the medical establishment's shift to treating hypothyroidism with pure thyroxine (T4) obscured the thermogenic importance of the active hormone triiodothyronine (T3), leading to a disregard for body temperature and metabolic rate in diagnosis. [Source 3] He also highlighted that cortisol actively blocks the thermogenic effects of sodium, allowing intracellular calcium to rise and damage cells, a process that accelerates with aging. [Source 4] A low-sodium diet itself was shown to accelerate the age-related decline in heat production, lowering the metabolic rate of brown fat and increasing fat synthesis. [Source 4]

Nutritional and environmental factors powerfully modulate thermogenesis. Peat identified **calcium**, **vitamin D**, **sodium**, **carbohydrates (especially sugar)**, and **protein** as key thermogenic nutrients, while noting that polyunsaturated fatty acids (PUFAs) create hypothermia and promote a torpor-like state. [Source 1, 2] He pointed to high-altitude living and a milk-based diet as two obvious thermogenic factors that slow the accumulation of harmful, age-related adaptations. [Source 1] Conversely, he argued that the body's energy production is profoundly drained by cold environments, as a large percentage of biological energy is lost as radiation if not reciprocated by infrared radiation from surroundings near body temperature. [Source 8] This principle underpinned his strong opposition to deliberate cold exposure, or *cold thermogenesis*, which he and his collaborators viewed as a harmful stress that chronically elevates adrenaline and cortisol, prematurely ages animals, and can suppress thyroid and gonadal function. [Source 5, 7, 9]

The pathological consequences of low thermogenesis are extensive. Peat described how a lower body temperature increases asthma symptoms and that the development of tumors thrives on the *inflammatory environment of a low brain temperature*. [Source 2, 5] He noted that the hot flashes of menopause, often misinterpreted as a surge in core heat, actually involve rapid heat dissipation through vasodilation driven by nitric oxide and estrogen, leading to a net decrease in body temperature. [Source 2] In contrast, the therapeutic elevation of body temperature, whether through fever or metabolic uncouplers like aspirin and dinitrophenol, has been recognized in unorthodox cancer treatments for over a century. [Source 5] Aspirin, despite its anti-fever reputation, is actually thermogenic due to its stimulation of mitochondrial oxygen consumption. [Source 2]

Supporting thermogenesis is therefore a comprehensive strategy for resisting inflammation and degeneration. Peat argued that reducing inflammatory factors through easily digestible foods to lower endotoxin, avoiding PUFAs, and consuming anti-inflammatory-thermogenic compounds like citrus flavonoids supports cellular respiration. [Source 1] The thermogenic effect of sodium also activates GABA-like sedative effects and increases slow wave sleep, the loss of which is a hallmark of aging. [Source 4] Georgi Dinkov extended this critique of cold stress, explaining that the conversion of white fat to brown fat via adrenergic mechanisms is a hallmark of cancer cachexia and uncontrolled lipolysis, making chronic cold exposure a dangerous practice. [Source 9] Ultimately, Peat's framework defines the maintenance of a high body temperature through robust oxidative metabolism as the foundational state of health, with every strategy directed at opposing the energy-depleting, hypothermic forces of stress. [Source 3, 8]

## People also ask

### How does thyroid hormone influence body temperature?

Peat argued that the active thyroid hormone T3 is a primary driver of thermogenesis, directly increasing metabolic rate and body temperature, and that reliance on T4-only treatments obscured this crucial thermogenic effect.

### Why did Ray Peat oppose deliberate cold exposure?

Peat and his collaborators viewed cold thermogenesis as a harmful stress that chronically elevates adrenaline and cortisol, suppresses thyroid and gonadal function, and prematurely ages the organism.

### What dietary factors support thermogenesis?

The corpus identifies calcium, vitamin D, sodium, carbohydrates like sugar, and protein as key thermogenic nutrients, while noting that polyunsaturated fatty acids promote a hypothermic, torpor-like state.

## Related concepts

- [Fatty Liver Disease](https://bioenergeticoracle.com/md/concepts/fatty-liver-disease/index.md)
- [Bioenergetics](https://bioenergeticoracle.com/md/concepts/bioenergetics/index.md)
- [Cancer](https://bioenergeticoracle.com/md/concepts/cancer/index.md)
- [Dopamine](https://bioenergeticoracle.com/md/concepts/dopamine/index.md)
- [Famotidine](https://bioenergeticoracle.com/md/concepts/famotidine/index.md)
- [Hair loss](https://bioenergeticoracle.com/md/concepts/hair-loss/index.md)

## Cited passages

Passage numbers match the `[Source N]` markers in the synthesis above.

### Source 1 — Body temperature, inflammation and aging

Ray Peat · Newsletter · 2020

> One of the best documented long lives was Old Tom Parr in England, who was taken to London at the age of 152 in 1635 to meet the king. All his major life events were recorded by the church. His normal diet was said to be old bread and cheese rinds.
>
> More recently, several areas with a high proportion of very old people have been noticed; these were in areas where the church kept accurate records of births, marriages, and deaths. In 1922, a professor of physical chemistry from the University of Kiev, Dr. Sadowein, reported that in the village of Derbent in the Caucasus, 20 people, in a population of 120, were over 100 years old. Their diet consisted almost exclusively of bread and fermented cow’s milk, with some sheep cheese. In other high altitude areas, such as the Andes, the use of sheep’s milk is very common, along with a high percentage of old people. Milk, calcium, and vitamin D are important thermogenic factors (Melanson, et al., 2003; Zemel, 2005). Exposure to bright sunlight, besides producing vitamin D, is thermogenic, increasing oxygen consumption.
>
> Calcium itself has powerful anti-inflammatory effects, but milk also contains a variety of protective anti-inflammatory peptides, and there is some evidence that fermentation produces additional anti-inflammatory peptides. Although a milk based diet could account for much of the health benefit of high altitude, even in the U.S. where the diet doesn’t differ much in higher altitude cities, there is a significant improvement of health and longevity at higher altitudes. In two large cities in Bolivia, each with a population of about 2.7 million (Santa Cruz, altitude 416 meters, La Paz, about 3800 meters), the city at moderate altitude has 6 people of at least 100 years, while the higher city has 48 (Zubieta-Calleja, 2017). Altitude and a milk based diet are obviously two important thermogenic factors that slow the accumulation of harmful adaptations, but there are many other controllable factors that could extend longevity even more.

### Source 2 — Body temperature, inflammation and aging

Ray Peat · Newsletter · 2020

> A lower body temperature increases asthma symptoms (Horton and Chen, 1979; Chen and Chen, 1982).
>
> The extent of hot flashes in menopause corresponds to the presence of inflammation and later, to the development of heart disease. Body temperature has been measured before, during and after menopausal hot flushes. Sweating and reddening of the skin are mechanisms for dissipating heat, so it isn’t surprising that the body temperature decreases quickly during the hot flush. Nitric oxide is involved in skin vasodilation, and estrogen increases nitric oxide in blood vessels of the skin. In the skin, progesterone’s thermogenic effect involves vasoconstriction (Charkoudian and Stachenfeld, 2016). To avoid thinking about estrogen’s possible role in the hot flash, many doctors prefer to insist that the episodes are the result of an increase in core temperature activating an unstable temperature regulating system.
>
> Probably because of aspirin’s anti-fever effect, the medical culture tends to think of it as antithermogenic, despite its known stimulation of mitochondrial oxygen consumption. Like thyroid hormone, aspirin prevents stress-induced loss of sodium, which is an important part of our temperature and energy regulating system. Physicians usually prescribe acetaminophen (also called paracetamol and Tylenol), which is hypothermic, instead of aspirin. Nutritional thermogenic factors include sodium, calcium, vitamin D, carbohydrates, especially sugar, and protein, which interact with our endogenous energy regulating factors, especially thyroid and progesterone.
>
> Things that decrease energy and body temperature increase some essential mediators of inflammation, and those changes are deeply associated with the processes of aging. A diet high in polyunsaturated fatty acids creates hypothermia and promotes torpor in animals before hibernation (Ruf and Arnold, 2008), and a high ratio of PUFA to saturated fats in the diet is associated with a shorter lifespan. For example, in mice on a calorie restricted diet, those receiving the more saturated lard lived longer than those receiving fish oil or soybean oil (López-Domínguez, et al., 2015).
>
> Inflammation is a kind of adaptive response, but it leaves behind some fibrotic changes and atrophy of functional cells, along with an increased tendency to resort to the inflammatory response.

### Source 3 — Body temperature, inflammation and aging

Ray Peat · Newsletter · 2020

> Our body temperature is maintained by the rate of energy production, and that’s mainly the result of the oxidation of fuels by mitochondria. The depth of the burning candle metaphor in our culture, and the belief that free radicals produced by mitochondrial respiration are the main cause of the changes occurring in aging, have led to a fear of things that increase our oxygen consumption and raise our body temperature, such as caffeine, and to a reverent attitude toward antioxidants such as vitamin C, and things that lower our oxygen consumption and body temperature such as serotonin, nitric oxide, and estrogen.
>
> In the 1930s, it was known that thyroid hormone increases the metabolic rate and raises the body temperature. Since serum cholesterol decreased in proportion to the increase of metabolic rate by thyroid supplementation, it was suggested that measuring cholesterol could be used to diagnose hypothyroidism. In the early 1930s Broda Barnes went to eastern Europe where hypothyroidism was endemic, and found that the three outstanding health problems in the area were infectious disease, heart disease, and breast cancer. When he later became a physician, he incorporated this knowledge into his practice, and through his career demonstrated that supplemental thyroid cleared up chronic or repeated infections and prevented death from heart disease. He also observed that anemia was often remedied by raising the body temperature. His work showed the value of keeping the body temperature close to the normal 98.6 F or 37 C .
>
> > This simple technique of measuring basal body temperature as a guide to determining thyroid function and permitting proper treatment when necessary did not appeal to the medical profession. Apparently some physicians had reservations about a test which might permit patients to arrive at their own diagnoses. Perhaps some had reservations because the test involved no fee.
>
> When the pure substance thyroxin became available and displaced the use of powdered thyroid gland to treat hypothyroidism, it led to two very important misconceptions that were incorporated deeply into the practice of medicine. It was decided that no more than 5% of the population was deficient in thyroid hormone, and experiments were used to argue that thermogenesis and increased metabolic rate and oxygen consumption weren’t important effects of the hormone, because the liver was the only organ that increased its oxygen consumption when thyroxin was added, and because added thyroxin decreased the brain’s oxygen consumption. The error was in defining thyroxin as the thyroid hormone.

### Source 4 — Salt, energy, metabolic rate, and longevity

Ray Peat · Article · 2007 · https://raypeat.com/articles/articles/salt.shtml

> Cortisol’s suppression of mitochondrial respiration is closely associated with its ability to increase intracellular calcium.
>
> Cortisol blocks the thermogenic effects of sodium, allowing intracellular calcium to damage cells.
>
> With aging, the tissues are more susceptible to these processes.
>
> The thermogenic effects of sodium can be seen in long-term studies, as well as short.
>
> A low-sodium diet accelerates the decrease in heat production that normally occurs with aging, lowering the metabolic rate of brown fat and body temperature, and increasing the fat content of the body, as well as the activity of the fat synthesizing enzyme (Xavier, et al., 2003).
>
> Activation of heat production and increased body temperature might account for some of the GABA-like sedative effects of increased sodium.
>
> Increasing GABA in the brain increases brown fat heat production (Horton, et al., 1988).
>
> Activation of heat production by brown fat increases slow wave sleep (Dewasmes, et al., 2003), the loss of which is characteristic of aging. (In adult humans, the skeletal muscles have heat-producing functions similar to brown fat.) Now that inflammation is recognized as having a central role in the degenerative diseases, the fact that renin, angiotensin, and aldosterone all contribute to inflammation and are increased by a sodium deficiency, should arouse interest in exploring the therapeutic uses of sodium supplementation, and the integrated use of all of the factors that normally support respiratory energy production, especially thyroid and progesterone.
>
> Progesterone’s antagonism to aldosterone has been known for many years, and the synthetic antialdosterone drugs are simply poor imitations of progesterone.
>
> But the drug industry is interested in selling new drugs to block the formation and action of each of the components of the RAAS, rather than an inexpensive method (such as nutrition) to normalize the system.
>
> [references]

### Source 5 — #41: Body Temperature  |  mRNA Vaccines  |  Vernadsky's Evolution  |  The CIA's Weaponized Culture

Ray Peat (with Georgi Dinkov) · Interview · Nov 28, 2020

> ## Health Questions: Temperature and Cancer
>
> **Ray Peat:** Yeah, if it's making the tumor blue, then that would absorb the red light.
>
> **Georgi Dinkov:** I guess heating the entire body has other benefits, right? If the brain operates better at high temperature, a better operating brain can control the tumor growth too.
>
> **Ray Peat:** Yeah, as a chronic thing, I think the development of the tumor thrives on the inflammatory environment of a low brain temperature.
>
> **Danny Roddy:** So all of these therapies that are promoted now online called cold thermogenesis is essentially asking for trouble?
>
> **Ray Peat:** Yeah.

### Source 6 — Speaking With Guest Danny Roddy on Baldness and Finasteride | Fireside Chat 195

Danny Roddy · Interview · Oct 19, 2021

> **Danny Roddy:** just has an amazing view of uh how the body works hormones energy although and now we're not talking about hippie energy we're talking about like real biological energy that your cells are producing but that's that's that's a good way to put it not hippie

### Source 7 — Crucial Facts About Your Metabolism - Discussion Between Georgi Dinkov & Dr. Mercola

Georgi Dinkov · Interview · Sep 17, 2023

> **Georgi Dinkov:** Florida gets so cold that you cannot go into the ocean in the winter?
>
> **Dr. Joseph Mercola:** Well, you could if you want to do cold thermogenesis. Yeah, the water goes into the low 60s, high 50s for sure. Now, South Florida is probably not as bad, but it is up here. So I just don't go in. So it's like six months out of the year. I mean, it's like in the mid 80s now, which is good. Oh, man, that is good stuff. I didn't want to follow up on it. Cortisol? Should we talk about cortisol? No, no, no. I can know. No, no. The finish just finished up in the whole thermogenesis. So the conclusion I had reached prior to your comment on this, which is different now, but was that it was okay for people if you were young. Because they could tolerate. Oh, sure. They could tolerate. They had much more resilience in reserve than the average person. So the intuition was spot on, but it really isn't good for anyone. Which is interesting because, you know, there's so many people. I mean, there's a lot of leaders in the biohacking space, and almost every single one of them are strong advocates of cold thermogenesis.

### Source 8 — #47: The Power Elite  |  Vaccines  |  Hair Loss  |  UFOs  |  Surviving The Great Reset with Ray Peat, PhD

Ray Peat · Interview · Jan 23, 2021

> ## Temperature and Metabolism
>
> **Danny Roddy:** Ray, what are you working on right now?
>
> **Ray Peat:** Aging of the cell. Following up on the effect of temperature. I concentrated on cold last time; this one is going to concentrate on the energy deficit effect, which can be produced by heat stress, reductive stress, or any stress that goes with energy deprivation.
>
> **Danny Roddy:** You mentioned to Patrick Timpone that the likely cause of many deaths is just the temperature getting too low.
>
> **Ray Peat:** Yeah. A lot of people don't bother checking the temperature of the mouth, eardrum, and extremities. Old people in particular might have a brain at a good temperature, but they're producing less energy, and that shows up as an extreme gradient from the extremities to the brain. The indoor temperature might be 70 degrees and seem safe, but even through insulated walls, the outside temperature can profoundly drain your body's energy-producing ability. That's because a large percentage of our biological energy goes out as radiation—microwaves and infrared. If it isn't reciprocated by returning radiation from something approaching body temperature, your body is draining vastly more energy. That's why aspirin, a snack before bed, progesterone, and thyroid are so important right before sleep.

### Source 9 — #17: Progesterone/DHEA Study Results, Field Biology, NAFLD, and Vitamin E with Georgi Dinkov

Georgi Dinkov · Interview · Feb 21, 2020 · https://open.spotify.com/episode/2Ari0W9sBDaSeJPiyQo5nb

> **Georgi Dinkov:** So I don't think he's a charlatan, but I think the idea – like basically they think that increasing the proportion of brown fat to white fat is a good thing. I don't think that's true because it's done through a stress mechanism, which is an adrenergic mechanism. So anything that promotes the chronic elevation of adrenaline is not likely to be beneficial. I mean, that's the primary method of increasing lipolysis in your body. So higher adrenaline cannot mean good health. And then even if you like the brown fat, just as I mentioned earlier, multiple studies demonstrated that in cancer patients, almost all of the fat converts from white to brown type, and basically they're in a chronic state of adrenergic excess, and they lose weight very well, you know, but not in a good way. And finally, there are multiple studies that show that once lipolysis exceeds a specific threshold, then you can get into a very rapid wasting syndrome, which is similar to cachexia, cancer, but not entirely, just by the virtue of having like a very high level of lipolysis uncontrolled. And I think most of these cold thermogenesis sessions that I've seen promoted, they last for hours and they're repeated on a daily basis. And I don't think that's safe. I think you can give yourself, you can severely suppress your thyroid gland and your gonadal function because the gonads are highly sensitive to temperature. They don't like very high temperature, but they certainly don't like low as well. So if you're going to be dipping your body in an ice bath, I mean, I don't think this bodes very well for your ovaries and your testicles. So

_Generated 2026-07-20 from the Bioenergetic Oracle corpus._