Uta and Dieter feel strongly that an athlete must learn to read their body. Uta's diet includes plenty of vegetables and whole grains. Vitamin and mineral supplements are employed, as well as sports drinks before, during, and after workouts. He figures the number of calories that Uta burns each day and cooks just the right amount of food to replace those calories. There is no deficit and no overage.
Dieter hates ice cream days.
It sounds as if no nutritional stone had been left unturned, yet Uta had been making a nutritional mistake that contributed to the colon problems that were so evident in the Boston race. She wasn't hydrating enough. It wasn't that she wasn't drinking water. She was making a real effort to drink water daily. It just wasn't enough.