Kate has cancer: Munich's chief doctor warns of genetic danger. Hereditary predisposition plays a key role, as gastroenterologist Dr.

Holger Seidl, chief physician at Munich's Isar Clinic, reports. One in ten cases of colon cancer occurs in a patient under the age of 50. Around ten percent of all colon cancer cases are diagnosed before 50 years of age. Munich's doctors are calling for an expansion of Colon cancer screening for younger people. If you don't drink enough fluids, you risk having hard stools and rarely having hard bowel movements. Fiber is important in your diet, especially whole grain products.