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.
Avoid fried foods, greasy foods such as potato chips and spicy bagels or breads. Fruits and Vegetables If you have ulcers, eat fruits that are low in acid, such as apples, peaches, pears, grapes, kiwifruit, bananas, berries and melons. Avoid all citrus, as high-acid oranges, grapefruit, tangerines, lemons and limes may increase stomach acids. Consume vegetables that do not cause you pain, discomfort or excess gas.