protein synthesis protein intake. you can eat a pound of steak and only ~32% of those amino acids actually become new protein in your body. the rest gets converted to glucose Nutritional Influences on Methylation Springer Nature Link Item Parental high ARA levels are associated with differential expression of genes involved in methionine cycle, transsulfuration pathway, and glutamate and glutathione metabolism in male F1 livers. Public Library of Effect of multi nutrient insufficiency on markers of one carbon metabolism in young women: response to a methionine load European Journal of Clinical Nutrition