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 One lab marker could reveal your risk for heart disease, brain decline, and poor detoxand most people have never heard of it. Homocysteine and methionine are key amino acids with a vital connection to glutathione one of your body's most important substances! Methionine is abundant in many foods, so protein isn't the culprit, Methionine an overview ScienceDirect Topics