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.
Avoiding Upset Stomach. 1  1. Know the risks. The tannins in green tea can upset your stomach because they cause your stomach to produce more acid. 2  2. Know who's at risk. The people at highest risk for this problem are those with stomach problems such as acid reflux. 3  3. Drink green tea with meals.