I think the primary reason for fasting
is the blood
. I doubt that eating would affect LFTs.
"...For example, males have higher transaminase levels than females. And, African-American men have higher AST levels compared with Caucasian men. Even the time of day that a blood
sample is drawn may influence the level of transaminase elevation. People appear to have higher transaminase levels in the morning and afternoon than in the evening.