I have, since going primal, done my best to not eat before workouts because I have realized that it is what causes the heartburn I get towards the end of each intense session. It doesn't matter what the food is, it always leads to the burn of indigestion, and acid ending up in my mouth.

However, Last night I did swim sprints and event though all I had was some coffee and bone broth (finished by 11am), I got heartburn at the end of my workout (which I did at 6pm).

What is going on here? All I'd had since 11 was water, how is this causing reflex?

Can anyone shed some light on this issue?

Thanks in advance,