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.
Foods high in fiber can be difficult for the body to digest during and after a bout of an upset stomach. Whole-grain breads, beans, and other lentils must be kept on hold, till the stomach heals completely. Vegetables such as cabbage, broccoli, Brussels sprouts, etc. and citrus fruits must also be avoided.