From a simple point of view, too much protein will cause a back up in the digestive system, especially if the fibre intake is low or non-existent. Holding onto waste is a detrimental to good health as ofit will cause a sense of feeling full, thst which can lead to loss of appietite or lessen food intake. It can cause constipation or impaction that can lead to hemorrhoids, piles, and anal fissures, which can lead to serious infection, surgery, and even death. There are many studies that prove fibre is essential, by not eating enough fibre it can lead to cancer. NurtionFacts.Org has a lot of helpful and useful information on health and food.