# Glycine-to-Methionine Balance

Category: Theories & Frameworks

Also known as: glycine-methionine balance, glycine to methionine ratio, amino acid balance

Methionine and tryptophan are the primary anti-metabolic amino acids whose restriction accounts for most of the protective, longevity-extending effects of reducing dietary protein. Ray Peat identified a threshold effect in exposure to these harmful amino acids, involving a…

9 passages · 3 authors · 2009–2025 · Most-cited: [Ray Peat](https://bioenergeticoracle.com/md/voices/ray-peat/index.md)

Canonical page: https://bioenergeticoracle.com/concepts/glycine-to-methionine-balance

## Synthesis

**Methionine** and **tryptophan** are the primary anti-metabolic amino acids whose restriction accounts for most of the protective, longevity-extending effects of reducing dietary protein. [Source 3, 9] Ray Peat identified a *threshold effect* in exposure to these harmful amino acids, involving a sensitive detection system throughout the body; above this threshold, methionine activates **mTOR**, which shortens lifespan and accelerates aging processes. [Source 3, 9] The main protective effect of **gelatin** in the diet derives from its complete deficiency in methionine, cysteine, and tryptophan, making it a therapeutic anti-inflammatory food recognized for nearly a century. [Source 2, 3]

Balancing the inflammatory amino acids with glycine is critical because glycine directly interferes with methionine absorption from the diet. [Source 1] Georgi Dinkov has explained that consuming gelatin or glycine with a methionine-containing meal causes you to absorb significantly less methionine, and that aspirin also interferes with the absorption of methionine and tryptophan. [Source 1, 5] Dinkov recommends eating at least a one-to-one ratio of collagen to the sum of methionine, tryptophan, and cysteine in muscle meats, noting that sufficient intake of the antagonist amino acids present in collagen provides the same benefit as methionine restriction without requiring orthorexic avoidance of meat. [Source 5] Mike Fave added that glycine is required to balance methionine's metabolism at multiple steps. [Source 7]

Peat emphasized that once full body size is achieved, the requirement for essential amino acids drops to a very low maintenance level, and that tougher cuts of meat containing more connective tissue, tendons, and ligaments naturally provide a better glycine-to-methionine ratio. [Source 2] He noted that in animal experiments, extreme restriction of methionine produced a 40% extension of lifespan, and speculated that eliminating tryptophan as well would yield an even greater extension. [Source 4] The range of injuries produced by an excess of tryptophan and serotonin—including fibrosis, free radical damage, inflammation, cell death from ATP depletion, mitochondrial damage, and diabetes—appears to be prevented or corrected by a generous supply of glycine. [Source 8]

Glycine itself functions as a *quieting, protective antistress agent* in every cell type, promoting wound healing and tumor inhibition. [Source 8] Peat observed that glycine and GABA are close structural analogs with similar inhibitory receptor actions, and that progesterone and pregnenolone act on the glycine receptor to increase inhibition, while estrogen opposes this effect. [Source 8] However, Peat cautioned that chemically pure substances are often disturbing to tissues, and that a large amount of any single amino acid can interfere with protein synthesis. [Source 6] For this reason, he considered the use of whole gelatin, associated with its normal biochemicals including steroid hormones from skin and **Mead acid** from cartilage, preferable to isolated glycine. [Source 8]

## People also ask

### How does glycine reduce methionine absorption from a meal?

Peat and Dinkov described that glycine directly interferes with methionine uptake in the gut, so consuming gelatin or glycine alongside methionine-rich foods causes significantly less methionine to be absorbed.

### Why is gelatin preferred over isolated glycine supplements?

Peat cautioned that large amounts of a single pure amino acid can disturb tissues and protein synthesis, so he considered whole gelatin preferable because it retains its normal associated biochemicals like skin steroid hormones and Mead acid.

### What ratio of collagen to muscle meat amino acids is recommended?

Dinkov recommended eating at least a one-to-one ratio of collagen to the combined methionine, tryptophan, and cysteine in muscle meats to obtain the benefits of methionine restriction without avoiding meat entirely.

## Related concepts

- [Beef](https://bioenergeticoracle.com/md/concepts/beef/index.md)
- [Glycine](https://bioenergeticoracle.com/md/concepts/glycine/index.md)
- [Methionine](https://bioenergeticoracle.com/md/concepts/methionine/index.md)
- [Taurine](https://bioenergeticoracle.com/md/concepts/taurine/index.md)
- [Anemia](https://bioenergeticoracle.com/md/concepts/anemia/index.md)
- [Calcium-to-Phosphorus Ratio](https://bioenergeticoracle.com/md/concepts/calcium-to-phosphorus-ratio/index.md)

## Cited passages

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

### Source 1 — #31: Estrogen for Libido? | PUFA and Hypogonadism | Overpopulation Hoax | Parabiosis | Cancer with Georgi Dinkov

Georgi Dinkov (with Georgi Dinkov) · Interview · Jul 19, 2020 · https://open.spotify.com/episode/6mO0fuDYLfG6rZQYQs1oT5

> **Danny Roddy:** Great stuff. Thank you, Georgi. Thank you, Gregory. Lennon, Paiva, thank you so much, Lennon, for 2R. Is that rupee maybe? Balancing glycine with methionine has the same effect in reference to our conversation a little bit earlier? Can you get the same effects of methionine restriction when you balance it with glycine?
>
> **Georgi Dinkov:** Yeah, actually, the more glycine you take, glycine directly interferes with methionine absorption. from the diet. So if you're taking gelatin with your food, and if that food contains methionine, you will absorb a lot less methionine if there is also gelatin taken at the same time, or glycine. Also, aspirin has been shown to interfere with the absorption of methionine and tryptophan. So taking aspirin with your food, aside from its other benefits, also interferes with the absorption of methionine. So you may be able to get by by eating your normal food, but simply forcing your body not to absorb as much methionine by using gelatin slash glycine slash aspirin.
>
> **Danny Roddy:** Good stuff. Thanks for that, Georgi. Thanks for that, Lennon. Harry Burgos, just for $10. So many of these people continually support the show, so we sincerely appreciate that. That allows these things to keep happening, so thank you so much, Harry, and everybody else that is just a chronic supporter of the show. John ZGR for $20. Thanks, John. He says, what is your opinion on porn-induced erectile dysfunction? If it is real, what is actually happening in the brain? Is it related to dopamine receptor downregulation? Many recover from ED a few months after stopping porn use.

### Source 2 — The Basics Of Pro-Metabolic w/ Dr. Ray Peat

Ray Peat · Interview · Nov 6, 2024 · https://www.youtube.com/watch?v=iAzwYYE44r8

> **Ashley:** I think it's important to also state that in order for the calcium regulation to occur properly, we also need magnesium and vitamin D. That's why milk is almost a perfect food because it contains all of those calcium, magnesium, and vitamin D. It really is a great food. a takeaway for someone who's looking to take their nutrition strategy to the next level and implement some of dr ray peat's nutrition principles i would say when you have a meal just try to think about that calcium to phosphorus ratio and so for example when i have like a ground beef like burger I'll make sure to add cheese on top because that's adding in calcium and maybe take some eggshell powder with that meal. So just make sure that you're considering that calcium to phosphorus ratio and including dairy products. And if you can't consume dairy right now because of the state of your thyroid or for allergies or anything like that, then eggshell powder is a great way to make sure that you're getting in enough calcium, I believe, like around... Three-fourths or one teaspoon a day will get you an additional 1,000 to 1,500 milligrams of calcium. Along those same lines, though, I think another important ratio that you talk about, Dr. Ray-Peat, is balancing the inflammatory and non-stressful amino acids. More like balancing that methionine and glycine ratio. Can you talk a little bit about why that's important? As an example, like a... filet tenderloin filet will have more inflammatory amino acids such as methionine but then bone broth will have the um more like glycine sources which will fight against some of those inflammatory amino acids so can you talk about why balancing those amino acids are important
>
> **Ray Peat:** yeah that's that's one of the virtues of hamburger over a tender steak is that they usually throw a lot of very, very tough stuff, pieces of tendon and ligament, the ends of muscles and such into the hamburger. And the gelatin happens to be completely free of the pro-inflammatory essential amino acids, cysteine, methionine, and tryptophan. And so almost 100 years ago, I think people were starting to recognize how important gelatin was as a therapeutic anti-inflammatory food, so that they were selling medical gelatin almost 100 years ago as a dietary treatment. And the tougher the meat is, the more gelatin, and so the less of the pro-inflammatory amino acids you're getting. And once you have achieved your full body size and are not growing in size anymore, then you need a small amount of all of the essential amino acids to maintain and repair the components and a little bit is used for shedding skin and the lining of your intestine and growing hair and nails. The essential amino acids are required all the way through lifespan, but at a very, very much lower at a level that's very gross and so many years ago I heard about old people who were seeming to get along fine on a diet of jello and crackers or jello and toast.

### Source 3 — Aging, Energy, Progesterone

Ray Peat · Newsletter · 2022

> In recent years, many studies have shown protective effects of diets with a lower ratio of protein to carbohydrate. Biochemically, the closest cells can come to metabolizing pure energy (the basic cause of aging according to the rate of living theory) is when they are responding to the ATP delivered by glucose (Chaudhari and Kipreos, 2018), defined as a high Respiratory Quotient, as opposed to the lower ratio when fat or amino acids are oxidized for energy. As the rate of living theory has taken over, with “logical” arguments, the actual measurement of oxygen consumption and CO2 production has been discouraged, and replaced by new technologies that estimate them without direct measurement—for example, the doubly labeled water isotope method and the proprietary Agilent “Seahorse XF Analyzer” technology. To the extent that physiological measurements are important for science and understanding health and sickness, the recent trends in measurement and explanation are catastrophic. Has “evolution” increased the efficiency of respiratory energy production, and is energetic efficiency of energy production a good thing? Within the rate of living theory of aging, those are common opinions. A maximum of fat storage on a minimum of food consumption is an example of high efficiency. The highly “wasteful” inefficient energy metabolism of “uncoupled” mitochondria improves adaptability to the environments, and extends longevity. In some fields, the need to hide failures of a belief system has produced very bad results.
>
> “In altitude studies, for example, it is generally accepted that mitochondrial volume density in human skeletal muscle diminishes with chronic high altitude exposure” (Jacobs, et al., 2018), but this result was caused by failure to account for the catabolic effects of the mountain environment, and the real effect of altitude hypoxia itself is the opposite, viz., total skeletal muscle mitochondrial volume density increases in response to high altitude exposure. This particular feature of high altitude physiology is very important for understanding the life-prolonging effect of living at high altitude. Aging corresponds closely to the decline of tissue mitochondrial mass, and things that preserve or restore mitochondria can preserve or restore tissue metabolism. When investigating the effects of a lower ratio of protein to carbohydrate, it has been found that certain amino acids account for most of the protective effects of reducing dietary protein, especially methionine and tryptophan.

### Source 4 — The Basics Of Pro-Metabolic w/ Dr. Ray Peat

Ray Peat · Interview · Nov 6, 2024 · https://www.youtube.com/watch?v=iAzwYYE44r8

> **Ashley:** So you would say that in addition to consuming more calcium sources as you age, making sure that you kind of start shifting a lot of your protein into more of the anti-inflammatory amino acid sources, such as like bone broth or making gummies using gelatin or things like that. And so I think a takeaway point for someone would be if you are going to consume like the... fillet tenderloin sirloin things like that just make sure that you're balancing that meal with a gelatin source so that's why whenever i have um kind of more pro-inflammatory amino acids i just like to make sure i'm always including like a cup of bone broth or tendons or having some gummies on the side um as well and i like your point that like as you start to age kind of start shifting your amino acid profile more towards these anti-inflammatory um amino acids and isn't it true so i think a lot of the like vegan um arguments point to all these studies showing how methionine and other pro-inflammatory amino acids like impair longevity and cause health issues but isn't there um evidence showing that like when that methionine is balanced by like glycine sources or these anti-inflammatory amino acids they see the same improvement with methionine restriction
>
> **Ray Peat:** Well, the extreme experiments almost eliminating the cyanide. In animal experiments, they got a 40% extension of lifespan. And I don't know of any studies where they eliminated also tryptophan. even a greater extension of lifespan if you knocked out most of the tryptophan.

### Source 5 — Animal-based vs. Ray Peat diet, a conversation with Georgi Dinkov

Georgi Dinkov · Interview · Dec 20, 2022 · https://www.youtube.com/watch?v=9ZM9sCfmAGc

> **Paul Saladino MD:** what i was going to ask you about the ability to balance the methionine with the glycine because i know there are some animal studies where they do methionine restriction and they get longevity but then they also supplement with glycine and they see improvements in longevity too i think it's going to be i mean i'm just thinking like i would have to be completely vegetarian to get 200 milligrams of methionine a day you know i'm only eating I right now I'm kind of playing with the amount of meat in my diet. I'll do a pound, a pound and a half, and I'll try and do mostly heart and organs and then, you know, a smaller amount of muscle meat. But even with that, I'm getting a couple of grams of methionine in my diet. It's just in there.
>
> **Georgi Dinkov:** There are some tricks you can do. Several studies that I've seen show that if you increase the intake of the branch and amino acids or collagen, they actually block the uptake of methionine from the gut. So you're not going to absorb it, right? And basically it's going to get excreted. And another aspirin also blocks the absorption of methionine, tryptophan and cysteine from the gut. So taking a tablet of aspirin, which probably has other beneficial effects. If it's done on a semi-regular basis, that's probably not a protective way. And finally, there was one study that kind of hinted that you don't have to necessarily restrict methionine, cysteine, and tryptophan. You just have to make sure you eat sufficient amount of these antagonist amino acids present in collagen. And then you're going to get the exact same benefit without going through this orthorexic exercise of like, my God, like this food, I really love it, but it's got too much methionine. No, eat it, but add a tablespoon of gelatin. It's not that difficult.

### Source 6 — Ray Peat Email Advice Depository — Post 871

Ray Peat · Email · Dec 3, 2022

> **Question:** Tue, May 31, 12:06 AM Hello Dr. Peat After experimenting with glycine last night (1g in OJ) I heard a LOUD scream in my ear while I was sleeping. Woke me up and scared me :) I Knew it was "in my head" because my extremely alert dog was sleeping. I also woke up with an extremely dry mouth, grogginess and fatigue. It also seems that glycine clogs my nose even more. What do you think is behind this mechanism? Increasing glutamate? Methylation issues? Much love
>
> **Ray Peat:** A large amount of any amino acid can interfere with protein synthesis.
>
> **Question:** Do you think 1g is a large amount of glycine? I had a similar experience to hearing strange sounds (usually when I sleep) when I was using gelatin and some GABAergic teas. You think impaired protein synthesis could induce these symptomes?
>
> **Ray Peat:** Chemically pure substances are often disturbing to tissues.

### Source 7 — BV7: Peter Attia Drops Fasting, Anthony Chaffee’s Fructose Claims, & Hidden Seed Oils in Restaurants

Danny Roddy · Interview · Feb 20, 2025 · https://www.youtube.com/watch?v=5D6kLP5L3Hc

> **Danny Roddy:** Can I throw out more complexity to this? I have talked to quite a few people that were allergic to those gelatin powders or they caused intestinal distress. And then the other thing is I was talking to one guy for a long time and he was having chronic hypoglycemia. And I think he had mentioned to me at some point that he always would add the gelatin to his coffee and he drank it, like mix it with sugar and milk. But... at some point i was like did you try removing the gelatin because i think that's it's also insulogenic like i think it can't lower the blood sugar and um anyways he removed it and it hypoglycemia went away that day or something so um yeah yeah dude uh and then do we talk about why glycine helps with methionine is it just like an exclusion type of thing does it help detoxify the harmful effects of the homocysteine like what what is it doing to help with the excess

### Source 8 — Gelatin, stress, longevity

Ray Peat · Article · 2009 · https://raypeat.com/articles/articles/gelatin.shtml

> But in every type of cell, it apparently has the same kind of quieting, protective antistress action.
>
> The range of injuries produced by an excess of tryptophan and serotonin seems to be prevented or corrected by a generous supply of glycine. Fibrosis, free radical damage, inflammation, cell death from ATP depletion or calcium overload, mitochondrial damage, diabetes, etc., can be prevented or alleviated by glycine. Some types of cell damage are prevented almost as well by alanine and proline as by glycine, so the use of gelatin, rather than glycine, is preferable, especially when the gelatin is associated with its normal biochemicals. For example, skin is a rich source of steroid hormones, and cartilage contains “Mead acid,” which is itself antiinflammatory.
>
> The other well-studied inhibitory neurotransmitter is GABA, so it's significant that GABA (gamma amino butyric acid) is a close analog of glycine (alpha amino acetic acid). A synthetic molecule structurally similar to those natural inhibitory “transmitters,” beta amino propanoic acid, has some of the protective effects of glycine and GABA. The other molecules in the series, at least up to epsilon amino caproic acid, have some of the same antiinvasive, antiinflammatory, anti-angiogenic, properties. Alanine and proline, with cell-protecting actions, have the same basic composition, carbon (CH2 or CH) atoms separating acid and amino groups. Even the amino acids in which the lipophilic carbon atoms extend out in a branched side-chain, valine, leucine, and isoleucine, have some of the antiseizure (inhibitory) action (Skeie, et al., 1992, 1994) of GABA and glycine.
>
> Tests done with one, or a few, of the relatively lipophilic (aliphatic) amino acids prevent seizures, while the “balanced” mixtures of amino acids permit seizures; unfortunately, results of this sort haven't led researchers to question the idea of “balance” that developed within the setting of agricultural research. The similarity between the structures and actions of glycine and GABA suggest that their “receptors” are similar, if not identical.

### Source 9 — Aging, Energy, Progesterone

Ray Peat · Newsletter · 2022

> When investigating the effects of a lower ratio of protein to carbohydrate, it has been found that certain amino acids account for most of the protective effects of reducing dietary protein, especially methionine and tryptophan. This accounts for the main protective effects of gelatin in the diet, since this protein is deficient in methionine, cysteine, and tryptophan, the main anti-metabolic amino acids. There is a threshold effect in exposure to the harmful amino acids, and this involves a very sensitive system for detecting their concentration, apparently involving the actin filament network throughout the body. Above the threshold concentration, methionine activates mTOR. Increased mTOR shortens life-span and increases the processes of aging. Increased fat in the diet increases mTOR, adding to the effects of amino acids. Several substances block the increase of mTOR, including the citrus flavonoid nobiletin, aspirin, and progesterone. Nobiletin preserves mitochondrial glucose metabolism, while protecting against the anti-metabolic effects of fat (Nohara, et al., 2019).
>
> The way these regulators of energy and aging interact is holistic, and it’s necessary to make generalizations about their problems. Things that inhibit mTOR will increase adaptation and organization with expansion of the time horizon, while things that activate it (methionine, estrogen, radiation) will accelerate cell growth and inflammation and activate terminal processes. Progesterone and estrogen relate to the degree of mTOR activity through the body as a whole, not just through a series of receptor intermediates. A high RQ, oxidizing mostly glucose, is so harmful, according to present metabolic consensus, that it would seem logical to emphasize the importance of the simple old BMR studies, measuring CO2 produced and oxygen consumed, but these have been abandoned in favor of complex new techniques, which replace measurements with estimates of those quantities (doubly labeled water isotope measurement, and the proprietary “Seahorse” apparatus). I suspect that the weight of the simple facts of oxygen consumption was so disruptive to the newer methods of treating hypothyroidism that they eliminated the use of the tests, instead of finding real justification for their practices. Oxygen consumption is no longer understood in the medical culture to be the basis for the physiological effects of thyroid hormone.

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