The investigators specific aim is to determine whether acute lysine administration leads to increased plasma 2-AAA in humans. Catabolism of lysine leads to generation of 2-AAA. In this study, the investigators will determine whether a single dose of lysine leads to increased plasma 2-AAA present in the blood and urine of humans. The investigators will ask 10 lean, healthy subjects to drink a beverage containing lysine and the investigators will measure the level of 2-AAA in their blood plasma and urine at baseline (before ingestion) and serially post-ingestion. The amount of lysine subjects will be given is equivalent to that which is found in a 10 oz. serving of beef. This pilot study will allow us to establish the relationship between lysine and 2-AAA in healthy subjects, and inform future studies on how to study the effects of 2-AAA on diabetes risk.