Descending colon. The colon is part of the large intestine, the final part of the digestive system. Its function is to reabsorb fluids and process waste products from the body and prepare for its elimination.The colon consists of four parts: descending colon, ascending colon, transverse colon, and sigmoid colon.escending colon. The colon is part of the large intestine, the final part of the digestive system. Its function is to reabsorb fluids and process waste products from the body and prepare for its elimination.
The USDA's Recommended Dietary Allowance (RDA) for protein is .8 grams per kilogram (or .36 grams per pound) of body weight. But that's not enough for athletes, according to the ISSN, which says endurance athletes like runners need 1.0 to 1.6 grams per kilogram a day (or .45 to .72 grams per pound).
Let's consider what types of food a runner needs before a long run, many of which could already be common staples in your diet. The most important things for runners to consider are carbohydrates, protein and fat. And getting the right balance of these three is important. Of a pre-race meal, about 60 percent should be carbohydrates, 20 percent protein and 20 percent fat [source: Tufts ]. Of course, runners can tweak this ratio to their liking.