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.
If you don't have a stomach ache, avoid these foods as they might give you one! Avoid wheat, corn, rye or other gluten-based foods. Gluten can cause or exacerbate stomach pain. Most of the wheat & corn on the market is GMO which can cause or worsen stomach pains.