text: is it unhealthful to exercise right after you eat? and im talking right after, without waiting an hour or two. i ate four subway sandwiches but i was running late because i had to play right after. i didnt really want to play but i i ended up starting and i started to feel burnin in my stomach and my heart. it feels better now but im wondering if i made a bad health decision to make my body suffer. you should atleast have a gap of 90 - 120mins before and after your exercises/training to have anything to eat.