Effect of health promotion materials on awareness of and adherence to WCRF/AICR cancer prevention recommendations among Lynch Syndrome carriers

Participants will fill out online or paper questionnaires at three time points: at baseline (T0), 4 weeks (T1) and 6 months afterwards (T2). Two weeks after T0 the intervention group receives the WCRF-NL health promotion materials.

The effects of WCRF-NL health promotion materials on primary and secondary outcomes will be evaluated at T1 and T2 and will be compared to T0, as well as to the scores of the control group at these time points.

The intervention group will receive one-time printed WCRF health promotion materials between the fist en second measurement, while the control group will receive these health promotion materials after finishing the last measurement. The materials include one general leaflet, which first explains the development of cancer and the different ways of prevention. After that, it continues with an explanation of each of the 10 WCRF/AICR cancer prevention recommendations: (1) Be as lean as possible without becoming underweight, (2) be physically active for at least 30 minutes every day, (3) limit consumption of energy-dense foods and avoid sugary drinks (4) eat more of a variety of vegetables, fruits, whole grains and legumes such as beans, (5) limit consumption of red meats (such as beef, pork and lamb) and avoid processed meats (6) if consumed at all, limit alcoholic drinks to 2 for men and 1 for women a day (7) limit consumption of salty foods and foods processed with salt (sodium), (8) don't use supplements to protect against cancer, (9) it is best for mothers to breastfeed exclusively for up to 6 months and then add other liquids and foods, and (10) after treatment, cancer survivors should follow the recommendations for cancer prevention.

The second leaflet is specially focusing on recommendations for the prevention of colorectal cancer. First, it explains colorectal cancer, its development and first signs. After that, it continues with describing risk factors for colorectal cancer and explains in more detail the lifestyle recommendation which have been related to a reduced risk of colorectal cancer.