Prospective cohort and multi-center studies indicate that high animal protein intake is associated with an increased risk of certain cancers, such as breast cancer and colorectal neoplasia.
The claim that a high protein diet increases the risk of cancer is supported by studies examining protein sources (specifically animal protein) and dietary patterns, which find positive associations with cancer incidence and colorectal neoplasia. Other papers in the set focus on plant proteins, soy, or broader dietary indices rather than contradicting the specific risk of high animal/total protein diets.