For a more specific reason other than it is "bad"...high protein diets are not recommended as it can cause gout - a very painful buildup of uric acid in their blood/joints. For this reason, be very careful not only in feeding your cham a high protein diet directly, you also need to watch how much protein is in your insect gutload. People have had issues when using things like dog/cat food, fish foods and chicken feeds to thier insects.