According to the American Heart Association, some high-protein diets restrict healthful foods and don't provide enough food variety to sufficiently meet nutritional needs. People who follow high-protein diets may have increased potential health risks.
High-protein foods include steak, chicken breasts, eggs and peanut butter. The concern is that eating too much of these foods too often will lead to the consumption of too much saturated fat, which can pose a heart-health risk.
There are a variety of high-protein foods with low saturated fat content that can be used in protein-rich diets.