Jogging Tips and Guidelines
The Familiar Food Rule
Dont eat or drink anything new before or during a race or hard workout.
Stick to what works for you. Your gastrointestinal tract becomes accustomed to a certain mix of nutrients, says Dallow. You can normally vary this mix without trouble, but you risk indigestion when prerace jitters are added.
The Exception If youre about to bonk, eating something new is probably better than eating nothing at all.