Colorectal cancer is one of the most common magnant diseases in the world. Being the third most common malignant disease in developed countries it represents an impotrant public health problem. The number of new cases worldwide is estimated at around 11 million per year, and about 7 million of deaths. Croatia is a country of medium incidence but of higher mortality from it. Colorectal cancer is the third cause of death in the Republic of Croatia. The exact cause of colorectal cancer is not known. Risk factors include: age over 40 years, genetic predisposition, inflammatory bowel disease, and environmental risks, such as dietary habits, obesity, physical inactivity, tobacco and alcohol abuse. 30-70% of all cases of colon cancer can be attributed to a diet rich in red and processed meat, which is usually lacking in fruits and vegetables. It is therefore recommended to limit intake of red meat and rare consumation of meat products. The usage of antioxidants and multivitamins it not proven to reduce the risk of cancer, and some studies even suggest an increased risk, so they are not recommended. Smoking and alcohol intake above 30 g/day is considered a risk factor, and it is recommended to avoid smoking and alcohol, or at least limit daily alcohol intake to 1-2 drinks for men and one drink for women. General obesity and obesity in the waist increase the risk of colon cancer. It is recommended to avoid a sedentary lifestyle, and implement moderate physical activity such as brisk walking every day for 30 minutes. Epidemiological studies 85% of cancers atribute to environmental factors. According to WHO at least one third of all cancers can be prevented by changing behavior and it is important to work on your health. Removing modifiable risk factors such as improper diet and increasing physical activity can affect on to the reduction of risks.