# Milk

Category: Foods & Substances

Also known as: dairy

Milk is a specialized mammalian secretion that Ray Peat considered the optimal food for supporting high metabolic rate and brain development, largely because it provides rapidly absorbable nutrients without the defensive chemicals found in plant foods. The rumen of a cow…

11 passages · 2 authors · 2011–2022 · Most-cited: [Ray Peat](https://bioenergeticoracle.com/md/voices/ray-peat/index.md)

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

## Synthesis

**Milk** is a specialized mammalian secretion that Ray Peat considered the optimal food for supporting *high metabolic rate* and **brain development**, largely because it provides rapidly absorbable nutrients without the defensive chemicals found in plant foods. [Source 1, 6] The rumen of a cow converts cellulose, lignin, and protein into a mixture of sugar, highly saturated fat, and peptides, which the animal then digests. [Source 1] For the human consuming it, milk supplies **lactose**, which is quickly metabolized into glucose, along with small amounts of *progesterone* and *thyroid hormone* that favor efficient energy use. [Source 1, 2] This hormonal and energetic support explains why brain growth is extremely rapid during the nursing period, continuing the trajectory of intrauterine development. [Source 1, 2] Peat argued that nervous systems process substance meaningfully, not just information, and that milk provides the substance for a developing brain to express its integral vitality. [Source 1, 6]

A central mechanism of milk's benefit is its high **calcium** content and its ability to suppress **parathyroid hormone (PTH)**. [Source 2, 3] Peat explained that a dietary calcium deficiency causes PTH to rise, which leads to bone softening, soft tissue calcification, high blood pressure, and increased inflammation. [Source 2, 10] He cited evidence that higher dietary calcium is independently associated with a lower risk of kidney stones, directly contradicting the common medical warning. [Source 2, 6] The calcium in milk is uniquely well-absorbed because its proteins prepare the intestinal lining for efficient uptake of both calcium and magnesium. [Source 4] Peat noted that consuming a large portion of the day's calcium at bedtime can reduce the nocturnal rise of PTH and the resulting loss of calcium from bones. [Source 2] This PTH-suppressing effect is also the basis for milk's role as a weight-loss food; Peat pointed to studies showing that increased calcium and vitamin D reduce obesity by stimulating calorie-burning uncoupling proteins and inhibiting fat-producing enzymes. [Source 2, 8]

Peat addressed common objections to milk consumption by contextualizing its components. The hormones in milk, including *testosterone* and *progesterone*, are present in amounts that are protective for the young animal, and human breast milk contains enough thyroid to prevent hypothyroid symptoms in infants with damaged thyroids. [Source 3] While milk does contain minuscule amounts of estrogen, Danny Roddy has written that this estrogen comes "prepackaged" with enzymes that make it readily available for excretion upon ingestion. [Source 5] Regarding the growth factor IGF-1, Peat argued that its stimulation by milk is not inherently harmful, as it is just one of many overlapping regulatory systems, and its effects are species-specific. [Source 9, 11] He also noted that the natural *trans-fats* in dairy are precursors to **conjugated linoleic acid**, a component with anti-inflammatory and anti-obesity effects that can block harmful polyunsaturated fats. [Source 8]

For adults, Peat recognized that milk's biological purpose as a growth medium means its methionine and tryptophan content is higher than optimal, and its phosphate ratio is slightly elevated relative to calcium. [Source 10] However, he considered its low iron content a significant advantage for preventing the iron overload that contributes to degenerative diseases. [Source 10] The fat content should be adjusted to activity level; Peat personally switched to 1% milk when he noticed weight gain from whole milk during a sedentary period in graduate school. [Source 4] For those who cannot tolerate milk, he recommended cooked greens as an alternative calcium source due to their high calcium-to-phosphate ratio, though he maintained that nothing is as effective as milk for optimizing calcium and magnesium absorption. [Source 4, 7] Roddy has extended this by outlining strategies for overcoming lactose intolerance, including introducing small amounts with meals, suppressing bacterial endotoxin with a raw carrot, and consuming milk with plenty of sugar and salt to restrain adaptive stress hormones. [Source 5]

## People also ask

### How does milk suppress parathyroid hormone?

Peat explained that milk’s high, well-absorbed calcium content lowers parathyroid hormone levels, which in turn helps prevent bone softening, soft tissue calcification, high blood pressure, and inflammation.

### Why did Peat consider milk’s low iron content beneficial?

Peat viewed milk’s low iron content as an advantage because it helps prevent the iron overload that he associated with contributing to degenerative diseases.

### What did Peat recommend for people who cannot tolerate milk?

Peat recommended cooked greens as an alternative calcium source due to their high calcium-to-phosphate ratio, though he maintained that nothing is as effective as milk for optimizing calcium and magnesium absorption.

## Related concepts

- [Cheese](https://bioenergeticoracle.com/md/concepts/cheese/index.md)
- [Parathyroid Hormone (PTH)](https://bioenergeticoracle.com/md/concepts/parathyroid-hormone-pth/index.md)
- [Vitamin A (retinol)](https://bioenergeticoracle.com/md/concepts/vitamin-a-retinol/index.md)
- [Acne](https://bioenergeticoracle.com/md/concepts/acne/index.md)
- [Adrenaline](https://bioenergeticoracle.com/md/concepts/adrenaline/index.md)
- [Aldosterone](https://bioenergeticoracle.com/md/concepts/aldosterone/index.md)

## Cited passages

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

### Source 1 — Adaptogenic Milk

Ray Peat · Newsletter · 2017

> Besides being nearly free of these, milk contains substances that promote the absorption of essential nutrients, though it might be better to think of it as providing nutrients without things that injure the intestine and interfere with the absorption of nutrients. For example, lactose has the reputation of increasing the absorption of calcium and zinc (especially in people who are lactose intolerant), but ordinary sucrose or fructose has a similar effect, at least when compared to the alternative carbohydrate, starch (Artus, 1975). Natural starches are always associated with the plant's defensive substances, as well as with nutrients, and those defensive chemicals are often specific inhibitors of animals' digestive enzymes. When a food isn't quickly digested by the animal, it supports the growth of bacteria in the intestine. In grains, the starches are likely to be associated with storage proteins (such as gluten), lignin and cellulose, and polyunsaturated fats, and these are harmful to the intestinal cells, apart from their interference with the process of digestion and assimilation of nutrients. Any food that provides simple nutrients, without causing inflammation and blocking enzymes, will support the animal's normal development, without activating stress responses. When the organism is free from threats and stresses, with a permissive milieu intérieur, and is able to just "be itself," what does it do? The integral nature of the animal involves a defining field, a shaping influence, and it's this field that organizes developmental and transgenerational changes in form and function such as those seen in Marion Diamond's study in rats, in the 1960s, under the influence of stressful or enriched environments, and hormones. In her studies, and in Zamenhof's experiments with chickens, in an optimized environment the brain developed to a degree previously unknown in those animals. The brain is an expression of the organism's unity and vitality, and with its sensory systems, it integrates metabolism, body composition and internal environment with the external environment. In these experiments, single substances — progesterone, glucose, or glycine which was converted into glucose (Zamenhof and Ahmad, 1979) — increased brain growth, by increasing either the supply of energy or the ability to use energy effectively. Milk provides lactose, which is metabolized quickly into glucose, and small amounts of other substances, including progesterone and thyroid hormone, that favor its efficient use.

### Source 2 — Adaptogenic Milk

Ray Peat · Newsletter · 2017

> Many doctors are telling their patients that drinking milk will cause kidney stones or will calcify their arteries. It's actually a low intake of calcium that increases the risk of kidney stones: "Higher dietary calcium from nondairy or dairy sources is independently associated with a lower kidney stone risk" (Taylor and Curhan, 2013). The main mechanism involves the harmful effects of the parathyroid hormone, and the fact that this hormone is inhibited by increased intake of calcium (Bergenfelz, et al., 1993), magnesium, and vitamin D.
>
> A deficiency of these has consequences much worse than kidney stones. When vitamin D or calcium is deficient, or when phosphate is excessive, and in hypoglycemia and stress (Ljunghall, et al., 1984), parathyroid hormone increases. This can lead to softening of bones, and hardening of soft tissues, especially arteries, sometimes brain, skin and other organs. Parathyroid hormone increases blood pressure, even before the calcium stiffening is detected. During the night, parathyroid hormone usually rises (Radjaipour 1986; Logue 1989, 1990; Fraser, 1998), and especially during aging, this causes a significant loss of calcium from the bones. Having a large part of the day's calcium at bedtime reduces the nocturnal rise of PTH and calcium loss from bones (Ohgitani, et al., 1997; Mortis, et al., 1997).
>
> The obesity epidemic that began about 40 years ago in the US has paralleled the decreasing milk consumption. Studies in both animals and humans have shown that a moderate increase in calcium and vitamin D reduces obesity and increases the metabolic rate, and a fair amount is known about the mechanisms involved. Several studies have found that milk drinkers are less likely to be overweight than milk avoiders. In middle age, milk avoiders gain weight steadily, while those drinking milk regularly lose a small amount of weight (Davies, et al., 2000; Teegarden, 2003; Heaney, 2003; Zemel, 2003). The reduction of parathyroid hormone by increased calcium and vitamin D is closely related to reduced obesity, and to the health problems associated with obesity — hypertension, insulin resistance, heart arrhythmias, depression, and various inflammatory conditions.

### Source 3 — Milk Calcium and Hormones East West Healing 2011

Ray Peat · Interview · 2011

> **Jodelle Fitzwater:** It’s fair to say dairy’s like a complete macronutrient; it’s carbs, proteins, fats. It’s very balanced in regards to regulating blood sugar, down regulating inflammation. It’s got a lot of pro-thyroid and progesterone properties at the same time.
>
> **Ray Peat:** Yeah. Milk even some testosterone. Thyroid, progesterone and testosterone… are important for the young animal. They found that the human milk contains enough thyroid hormone that babies whose thyroid was destroyed by living near Three Mile Island during the accident, didn’t suffer any symptoms of hypothyroidism as long as they were being breastfed, because of the high protective hormone content of the milk.
>
> **Jodelle Fitzwater:** Can you talk about the calcium in the milk; how the calcium, parathyroid, all these things work together in assisting the body in having normal levels of calcium with chronic stress and so forth ?

### Source 4 — One Radio Network: Nothing is as it seems with COVID (July 20, 2020)

Ray Peat · Interview · Jul 20, 2020

> **Patrick Timpone:** Boy, milk, though, as you know, milk has sure gotten a bad rap, especially more so in the natural world over the last, what, 25 years, Dr. Peat? In the mainstream, people in the mainstream still drink some milk, but... And, you know, not too many people in the natural world think they've been told it's terrible. You can sort it. It was only meant for cows and all kinds of stuff, right?
>
> **Ray Peat:** Yeah. And if you look at the culture, it's getting fatter and fatter. And milk happens to be the best weight loss food there is because the high calcium assimilation from it increases our metabolic rate, the combination of protein and and calcium and magnesium is ideal for increasing our ability to burn calories.
>
> **Patrick Timpone:** That's interesting. That is so interesting. And that plays along with the whole idea that we were sold, Doc. When was it? I guess early 90s, you know, that fat was bad. And that's when the whole low-fat thing really came on board, right?
>
> **Ray Peat:** Yeah, the fat has to be adjusted to your activity level. If you're burning 5,000 calories a day, you can handle the fat of something like whole milk. But I found when I was in graduate school that drinking a gallon a day of 2% milk, I was starting to get fat. So I changed to 1% and have stayed the same weight ever since.

### Source 5 — The Peat Whisperer

Danny Roddy · Book · 2012

> ### Milk
>
> **Danny Roddy:** When compared to muscle meats, milk has a higher calcium-to-phosphate ratio, contains preformed vitamin A, and contains low amounts of iron. Although the tryptophan content of milk is high, calcium’s role in increasing carbon dioxide (CO2) influences levels of serotonin in the blood.16 Milk contains the protective hormones testosterone and progesterone, but also contains minuscule amounts of estrogen. While any excess estrogen is undesirable, the estrogen in milk comes “prepackaged” with enzymes that make it readily available for excretion upon ingestion.17 The benefits of milk include nutrient density (calcium especially), low unsaturated fat content, lack of fiber, lack of iron, no anti-nutrients (phytic acid), and is extremely convenient (no cooking). Finding the “right type” of milk (raw, pasteurized, ultrapasteurized, lactose-free) can be a challenge for some. In regards to raw milk, some may find the probiotic bacteria to disagree with their gut ecosystem. While counterintuitive, pasteurized or even ultrapasteurized (and lactose-free) varieties may be better tolerated.18 Overcoming lactose intolerance strategies include: introducing small amounts (1/2 c.) with each meal for several weeks, suppressing bacterial endotoxin with a daily raw carrot,19 becoming vitamin A replete (which can help with numerous allergies), and consuming milk with plenty of sugar and salt to restrain adaptive stress hormones.

### Source 6 — Adaptogenic Milk

Ray Peat · Newsletter · 2017

> Milk provides lactose, which is metabolized quickly into glucose, and small amounts of other substances, including progesterone and thyroid hormone, that favor its efficient use. During the time when young mammals are being nursed, their brain growth is extremely fast, continuing the rapid intrauterine brain growth, when those same substances were provided.
>
> Computers are said to "process information," and nervous systems are often analyzed as if they were computers; however, nervous systems, like living systems in general, process substance meaningfully, not just information. Every nervous system, every bit of living stuff, exists as part of a bigger life supporting system, or "ecosystem," and the larger system is shaped by the way its components process substance. V.I. Vernadsky emphasized the importance of high-metabolizing brains for the stability of the Biosphere which sustains them. As the Noosphere concept, based on Vernadsky's work, was developed and popularized by Teilhard de Chardin it took on an abstract quality that has obscured Vernadsky's sense of urgency in recognizing our shared metabolisms throughout the Biosphere. Questions of health are necessarily questions about the deteriorating environment. There have been several studies showing that drinking milk protects against dementia or milder "cognitive impairment" (Kliem and Givens, 2011; Crichton, et al., 2010; Chan, et al., 2013; Ahmadian-Attari, et al., 2014; Ozawa, et al., 2014). For example, drinking milk almost daily, rather than "less than four times a week," reduced vascular dementia by 65% (Yamada, et al., 2003). When animals are exposed to pollution, their fats accumulate oil soluble toxins, such as DDT and dioxins, and in those situations low-fat milk will be safer than full-fat milk or cheese. Nevertheless, milk fat generally contains a lower level of toxins than body fat and fat meats. Historically, cow's milk has been an important factor in protecting children from radioactive isotopes such as strontium-90, since the ratio of calcium to strontium is increased as the contaminated forage or grain is processed by the cow. Many doctors are telling their patients that drinking milk will cause kidney stones or will calcify their arteries.

### Source 7 — #118 - The truth about estrogen replacement therapy, calcium and milk myths with Dr Ray Peat and Kate Deering

Ray Peat · Interview · May 23, 2022

> **Kate Deering:** yeah well it seems to you know they use it in a lot of different ways in today's world when they just want to push an agenda they can just focus on one or two things and and forget all the other things um it seems to be a popular way to approach uh science or whatever that you want to call these days um okay we got a few more questions about milk just to kind of round it up um And I just probably said, what type of milk is best? And I think you answered it probably by the one that works best for you. and how important the quality of the animals are being treated and what they're eating. And that is a pretty important part. So in your view, is it that important if the milk is raw or pasteurized or ultra pasteurized, or even if it has additives in it, it's just basically finding which one works for the individual, correct?
>
> **Ray Peat:** Mm-hmm.
>
> **Kate Deering:** Okay. So even if a milk has certain additive, because obviously in most areas there's nutrients added to milk that are low fat, but as long as someone can tolerate those and seem to do okay, then that is okay.

### Source 8 — Milk Calcium and Hormones East West Healing 2011

Ray Peat · Interview · 2011

> **Jodelle Fitzwater:** Does dairy intake cause body weight increase ?
>
> **Ray Peat:** The mechanisms that I mentioned, inhibiting the fat-producing enzyme system and stimulating the calorie burning uncoupling protein, those are clearly established. Papers by Michael Zemel and his group (Sun, Shi and others) – they’ve done some very good studies on curing obesity with milk products. But there are a lot of other groups that have noticed that milk drinkers are very rarely obese (chronic users of a quart of milk or more a day).
>
> **Jodelle Fitzwater:** So, you’re saying weight gain is actually a positive sign ?
>
> **Ray Peat:** No. Weight gain in obesity is not known to be produced by milk. If you ate nothing but Haagen Dazs ice cream, you could get fat. But milk, with it’s high ratio of protein and calcium to the fat, is the best way to lose weight. Except that it does help to build muscle. Its anti-inflammatory, anabolic effect helps to build muscle, which is a good way to gain weight.
>
> **Jodelle Fitzwater:** Is dairy a natural source of trans-fats ?

### Source 9 — Herb Doctors: Milk

Ray Peat · Interview · Aug 19, 2011

> **Andrew Murray:** Yeah, good job too. Okay. Whilst I think probably some of tonight’s – the reason for tonight’s show was perhaps some erroneous science that was thrown as a kind of curveball, suggesting perhaps that there were inherent problems with using milk and /or – I know that the people perhaps who are lacto-vegans or vegans would certainly perhaps benefit to hear – your opinions surrounding milk. And I’ve got lots of different questions so far as points that were brought up in a seminar given by a Pedro Bastos, who was presenting a talk on milk and had various different “science” surrounding – fors and againsts, some of which we will get into. So in terms of – I know that you are very big on milk. You are an advocate of drinking milk. I’ve never consumed so much milk, I don’t think, in my life apart from when I was young. I very much enjoy drinking milk, but kind of grew out of it as I think perhaps most people do. But, inherently, there is such a lot of positive benefit from drinking milk that the anti-dairy or the pro-soy groups would probably would be just as well to listen and tune into this month’s show because there is plenty of evidence that show that milk is actually very beneficial for you and it’s perhaps in our best interest to make sure that we can get back into drinking milk. And if we don’t – for one reason or another, we’ve stopped drinking it. So about some of the arguments against milk, I know that in Pedro Bastos' article, he mentioned that insulin growth factor was stimulated fairly strongly by milk. What do you have to say about IGF and/or its stimulation from milk, how true is that?
>
> **Ray Peat:** Well, it has some of the features of insulin, but it and insulin are just two of our regulatory factors that when one of them is slightly distorted we have so many other regulatory systems that nothing really changes much when one is a little off-center.

### Source 10 — Milk in Context Allergies Ecology and Some Myths

Ray Peat · Article · 2011

> PTH increases the activity of nitric oxide synthase, and nitric oxide is a factor in the vascular leakiness that is so important in MS.
>
> There are components of milk that might protect against tooth decay by inhibiting the binding of bacteria to teeth.
>
> David McCarron has published a large amount of evidence showing how calcium deficiency contributes to high blood pressure. The chronic elevation of PTH caused by calcium deficiency causes the heart and blood vessels to retain calcium, making them unable to relax fully.
>
> Intravenous infusion of calcium can relax blood vessels and improve heart function. The suppression of PTH is probably the main mechanism.
>
> PTH (like estrogen) causes mast cells to release promoters of inflammation, including histamine and serotonin. Serotonin and nitric oxide contribute to increasing PTH secretion.
>
> Removal of the parathyroid gland has reduced heart problems and mortality and insomnia in people with kidney disease and excess PTH.
>
> Increased carbon dioxide, for example when adapted to high altitude, can greatly decrease PTH. Frequent, but smaller, meals can reduce PTH.
>
> Cancer cells often secrete PTH and related proteins with similar effects on calcium, and the PTH stimulates the growth and invasiveness of prostate cancer cells, and seems to be as closely involved with breast cancer. The PTH-related protein is associated with calcification in breast cancer. Microscopic calcium crystals themselve produce inflammation.
>
> Besides being an ecologically favorable source of calcium, protein, sugar, and fat, the composition of milk causes it to be digested efficiently, supporting the growth of bacteria that are relatively safe for the intestine and liver, and reducing the absorption of endotoxin.
>
> Dividing any food into smaller meals can lower the PTH, and milk is a convenient food to use in small amounts and frequently.
>
> Some amino acids directly stimulate insulin secretion, decreasing blood sugar and leading to the secretion of cortisol in reaction to the depression of blood glucose. The presence of lactose in milk, and of fat, to slow absorption of the amino acids, helps to minimize the secretion of cortisol. The main protein of milk, casein, seems to have some direct antistress effects.
>
> Since milk's primary biological function is to support the growth of a young animal, some of its features make it inappropriate as a sole food for an adult.

### Source 11 — #118 - The truth about estrogen replacement therapy, calcium and milk myths with Dr Ray Peat and Kate Deering

Ray Peat · Interview · May 23, 2022

> **Ray Peat:** Yeah.
>
> **Kate Deering:** Okay. So if someone has an issue, I've had people say that literally they've had cancer and so they won't drink milk. And I find that doesn't make a lot of sense, but I think it's the premise that they think that the hormones are going to affect them.
>
> **Ray Peat:** Yeah, I think it's one of the tricks of the anti-milk cultures.
>
> **Kate Deering:** Yes, they are out in full force these days. What about people who drink milk and they say milk is giving me acne? What would you say is going on there?
>
> **Ray Peat:** Milk does what?
>
> **Kate Deering:** Gives them acne. They start to get acne on their skin. Skin issues.
>
> **Ray Peat:** Yeah, maybe they're drinking too much fat with it. Any kind of fat in excess will disturb your skin energy production. And for any cell, its functions decrease under the influence of fat rather than sugar.
>
> **Kate Deering:** So if someone thinks that they're drinking milk and they're getting acne, then maybe consuming a lower fat milk would be to their benefit.
>
> **Ray Peat:** I think so.
>
> **Kate Deering:** Okay. Okay. And what about milks linked to increasing insulin growth factor? So that's a conversation as well. They think it is having an effect on this growth factor. What would you comment on that?

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