Glycine and branched-chain amino acids (BCAAs) play distinct roles in the body, and their impact on longevity varies.

Glycine:
Role in Longevity: Studies have shown that glycine supplementation can extend lifespan in various organisms, including mice. This effect is partly due to glycine’s ability to mimic methionine restriction, leading to enhanced autophagy and improved metabolic health.

Branched-Chain Amino Acids (BCAAs):
Role in Longevity: Research indicates that high dietary intake of BCAAs may have mixed effects on health and lifespan. While BCAAs are essential for muscle protein synthesis, excessive intake has been associated with metabolic disturbances, such as insulin resistance and obesity, particularly when combined with high-fat diets. In mice, lifelong restriction of dietary BCAAs has shown sex-specific benefits, including extended lifespan and reduced frailty in males.

Conclusion:
While glycine supplementation appears to have a positive impact on longevity, excessive intake of BCAAs may have adverse effects, especially in certain dietary contexts. Balancing amino acid intake, considering individual health status and dietary habits, is crucial for promoting healthy aging.

Sources:

https://pubmed.ncbi.nlm.nih.gov/37004845/ https://pubmed.ncbi.nlm.nih.gov/37964763/ https://pubmed.ncbi.nlm.nih.gov/33796866/

https://pubmed.ncbi.nlm.nih.gov/29369529/

Now as we know glycine is good for your longevity, and BCAAs are bad, the next question:

What are the foods with highest glycine to BCAAs ratios?

To maximize glycine intake while minimizing branched-chain amino acids (BCAAs), focus on foods that are rich in glycine (collagen, gelatin, skin, and connective tissue) but lower in BCAAs (which are abundant in muscle meats and dairy).

Best Foods with High Glycine-to-BCAA Ratio
✅ 1. Collagen-Rich Foods (Highest Glycine, Very Low BCAAs)
Bone broth (especially from beef, chicken, or fish bones)
Gelatin (powdered gelatin, gelatin-rich meats)
Chicken skin & pork rinds

✅ 2. Organ Meats (Moderate Glycine, Lower BCAAs Than Muscle Meat)
Liver (beef, chicken)
Heart (beef, lamb)
Kidney

✅ 3. Certain Seafood (High Glycine, Lower BCAAs Than Red Meat)
Shrimp
Octopus
Squid
Fish skin (salmon skin, mackerel skin)

✅ 4. Egg Whites (Good Glycine Source, Moderate BCAAs Compared to Whole Eggs)

✅ 5. Plant-Based Options (Good Glycine, Lower BCAAs Than Meat & Dairy)

Sesame seeds & tahini
Pumpkin seeds
Sunflower seeds
Legumes (lentils, chickpeas, black beans)
Foods to Minimize If Reducing BCAAs
❌ Muscle meats (beef, chicken breast, pork, turkey, lamb) → High in BCAAs
❌ Whey protein & dairy (milk, cheese, yogurt) → High BCAAs
❌ Soy protein & pea protein powders → High BCAAs

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