Amino acids
Glycine
Glycine is the principal amino acid in gelatin and collagen, and Ray Peat framed it as a primary antistress molecule whose generous intake counteracts the degenerative effects of consuming isolated muscle meats. Peat argued that eating only muscle meats produces an amino acid…
Glycine is the principal amino acid in gelatin and collagen, and Ray Peat framed it as a primary antistress molecule whose generous intake counteracts the degenerative effects of consuming isolated muscle meats. Peat argued that eating only muscle meats produces an amino acid balance entering the bloodstream identical to that generated by extreme stress, where cortisol excess breaks down the body's own tissues. The excess tryptophan and cysteine from muscle meats suppress thyroid function and increase serotonin, while a generous supply of glycine prevents or corrects the range of injuries produced by this profile, including fibrosis, free radical damage, inflammation, and mitochondrial damage. Peat therefore recommended traditional whole-animal eating—consuming skin, cartilage, and broths—to assimilate large amounts of glycine and gelatin, noting that gelatin is preferable to isolated glycine because it provides a balanced complex of associated biochemicals, including alanine, proline, and steroid hormones.
Glycine's protective actions operate through multiple mechanisms. Peat described it as an inhibitory neurotransmitter that stabilizes nerve cells electrically, increasing the amount of stimulation required to activate them, which is protective in epilepsy, stroke recovery, and the regulation of sleep, breathing, and heart rhythm. He noted that glycine and GABA share similar structures and actions, and that their receptors may be similar if not identical; both progesterone and pregnenolone act on the GABA and glycine receptors to reinforce their inhibitory effects, while estrogen has the opposite action, inhibiting GABA and antagonizing glycine's calming influence. Georgi Dinkov has extended this by specifying that glycine is a chloride channel opener, and that the resulting chloride influx hyperpolarizes the cell, allowing it to relax—a state of high cellular potential that antagonizes the excitotoxic influx of calcium, estrogen, and glutamate. Peat also emphasized glycine's powerful antiinflammatory actions, which oppose the NF-kappa-B pathway activated by estrogen and endotoxin, and its antitumor effects, including the inhibition of angiogenesis.
Dinkov has elaborated on several additional dimensions of glycine's activity. He reported that glycine possesses a universal antiviral effect by inhibiting the formation of viral capsids, the protective shell without which newly produced viral particles are vulnerable to immune neutralization. He also described glycine as a functional antagonist to stress and cortisol, noting that it inhibits the receptor GPR158, which is activated by glucocorticoids and drives both depression and tumor development. Regarding glucose metabolism, Dinkov cited a human study showing that six grams of glycine blunted the postprandial blood glucose response by approximately 50%, with both glucose and insulin declining in parallel, suggesting glycine helps the body utilize glucose with less insulin, possibly by blunting the cortisol rise that follows a meal. He further noted that glycine is the major inhibitory neurotransmitter in the spinal cord and regulates gastrointestinal motility, such that insufficient glycine impairs digestion even in the absence of gut inflammation.
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. He preferred gelatin as a source, which delivers glycine alongside its normal biochemical context. Dinkov has observed that glycine's anti-aging and pro-health effects are unmatched by any other amino acid, and that some countries sell glycine as a regulated drug; in Russia, a combination pill of 100 mg glycine and 100 mg aspirin is recommended as a general anti-inflammatory for people over fifty, with the combination producing a stronger effect than either substance alone. He also noted that both glycine and taurine may eventually be reclassified as essential amino acids because without them the body cannot produce bile acids required for fat digestion.
People also ask
- How does glycine counteract the stress-like effects of eating muscle meat?Peat argued that muscle meats create an amino acid profile similar to that produced by extreme stress, while a generous supply of glycine prevents or corrects the resulting fibrosis, inflammation, and mitochondrial damage.
- Why did Peat prefer gelatin over isolated glycine supplements?Peat cautioned that chemically pure amino acids can disturb tissues and interfere with protein synthesis, so he recommended gelatin because it delivers glycine alongside a balanced complex of associated biochemicals like alanine and proline.
- What role does glycine play in calming the nervous system?The corpus describes glycine as an inhibitory neurotransmitter that stabilizes nerve cells by opening chloride channels, which hyperpolarizes the cell and antagonizes excitotoxic signals, with progesterone and pregnenolone reinforcing this calming effect.