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.
Any number of things can cause an upset stomach. Flu bugs, anxiety, eating spicy food or food that is high in fat, and even food poisoning can cause indigestion. One possible cause of indigestion that sometimes goes unnoticed is changes that may occur to your diet. One of the ways that changing your diet can cause an upset stomach is through food intolerances.