Creatinine is transported through the bloodstream to the kidneys. The kidneys filter out most of the creatinine and dispose of it in the urine. Because the muscle mass in the body is relatively constant from day to day, the creatinine production normally remains essentially unchanged on a daily basis.
When you have an upset stomach, avoid acidic foods, he says. 1  Fatty Foods Fatty foods stimulate contractions in the digestive tract, which, surprisingly, can either slow down the emptying of the stomach and worsen constipation or speed up movement and worsen or lead to diarrhea.
Use dry and/or salty foods like crackers, bread or toast, to calm the stomach. Protein foods can improve nausea and sweet foods can sometimes worsen it, so avoid sweet foods at breakfast. Instead, start your day with a small amount of protein such as a hard-boiled egg or leftover chicken.