Im 20. I've had really fast metabolism my whole life. I eat more than my peers, and interestingly, im really skinny! But up until 4 months ago, I started experiencing acid refulx and indigestion. Ive been taking zantac every night, which fixes the symptoms, but I deal with indigestion almost every day from less acid in my stomach. Was this possibly caused by me eating a lot of food for the past 20 years and wearing down my high metabolism? because now i taste the same food i ate 3 hrs ago! Yuck!