Swapping out ultra-processed bread with whole-grain cereal is a simple change that may help reduce the risk of colon cancer, research suggests.d3sign/Getty ImagesUltra-processed foods are linked to a higher risk of colon cancer, and some may be worse than others.A nutrition researcher explains how he avoids the riskiest kinds of ultra-processed foods.Instead, he recommends foods like whole grains and yogurt, which help protect the gut.For more t…