A new study published by the USC School of Gerontology analyzed 6,318 middle-aged adults for 2 decades and found that those consuming high amounts of animal protein were twice as likely to die of all causes and 4 times more likely to die from cancer than those eating low amounts of protein. Vegetable sources of protein did not have the same effect. Moderate protein intake also had detrimental effects. In contrast, the researchers found that plant-based proteins, such as those from beans, did not seem to have the same mortality effects as animal proteins.
While high protein diets are have been all the rage over the last few years for their waist-whittling goodness, a new study says they could be as bad for you as smoking.