when riding a bike on a full stomach why do you cramp up and what two body systems are envolved?

When riding a bike on a full stomach, cramping can occur due to the diversion of blood flow away from the digestive system to the muscles being used for cycling. This can lead to gastrointestinal discomfort and muscle cramps, as the body struggles to manage both digestion and physical exertion simultaneously. The two body systems involved in this process are the digestive system, which handles food processing, and the muscular system, which is responsible for movement and exertion during cycling.