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.
In general, you should choose bland foods when youâre having digestive problems, and be sure to avoid spices if youâre sensitive to them. 4 / 12 Acidic Foods Tomato sauce and citrus fruits, such as lemons, limes, oranges, and grapefruit, are acidic and can irritate the stomach lining, causing digestive problems.