In plain words
Glycine is one of the building blocks of protein. It is the smallest amino acid. The body can make it, but it is used in large amounts to build , the main protein in skin, bone, and connective tissue. Glycine is found in high amounts in , skin, and bone broth. In pregnancy, the body's need for collagen and related compounds rises as the baby, placenta, and uterus grow. Some researchers call glycine conditionally essential for this reason. That means the body may not make enough on its own at certain times. Whether this matters for a healthy pregnancy is debated. Most people who eat a varied diet get glycine from many sources, including meat, fish, dairy, and eggs.
The deeper version
Glycine is the smallest proteinogenic amino acid and the most abundant amino acid in collagen, which has roughly one third glycine in its repeating Gly-X-Y motif. It is a precursor for heme, glutathione, creatine, purines, and serine. Demand rises when collagen synthesis and one-carbon unit production increase, as in pregnancy. Glycine is considered conditionally essential in humans, a term for amino acids whose endogenous synthesis cannot always meet demand. Wu (Amino Acids: Biochemistry and Nutrition, 2013) reviews this framing. One physiological argument for whole-animal foods, such as broth and skin-on meat, rests on this demand. Trials testing glycine for pregnancy outcomes are few, and evidence that it changes outcomes is limited. The debate is whether conditional essentiality matters clinically for people eating a varied diet.
Where it comes up
- Bone brothNourishment and Traditions
- Protein: how much and from wherePregnancy: Eating
- Traditional pregnancy foods across culturesPregnancy: Eating
What mothers here say about glycine
No one has posted under this term yet.
Sources
- Wu G — Amino Acids: Biochemistry and Nutrition (2013)