The study of how the body uses the nutrients in food is called food science or nutrition science. Nutrition science is specifically designed to investigate how and what is the mechanism behind nutrient absorption and how our body responds to different food stuffs.
You should wear tight compression outfits to decrease the possibility of drag, especially in an olympic race. You could even wear a swim hat to lower drag from your hair.
Make new friends who respect decision not to use drugs
you can make and excuse to the person whom is giving you
1. drinking alcohol and smoking cigarettes
2. over eating
3. lack of exercise
4. lack of sleep
5. dieting on junk food