Hi, Every time I lift heavy things on an empty stomach, It affects my belly. Symptoms are pain, diarrhea, lost of appetite. Then I have to either get a masseur to press my spinal back or something like that to fix that. How to prevent such thing from happening? In terms of medicine, how is it called this phenomenon? Thanks. Regards Avi (i m a male aged 30 yrs. 1m70 and physically fit, athletic body)