Digestion during running
During running, extra blood flows to your legs. As a result, there is less blood present in the gastrointestinal tract. A large or heavy meal takes a little longer to digest than a small, light meal. Therefore, running immediately after eating a large meal is not a good idea. The blood needed to digest this meal flows away to the legs. Digestion is temporarily halted so that the meal remains in the stomach and is barely processed. Stitches in the side, a sloshing feeling, bloating, nausea or gastrointestinal distress are then the order of the day.