The hype: Actresses including Jennifer Aniston, Kirsten Dunst, and Gwyneth Paltrow, have all reportedly done the pH or "Alkaline" diet, which advocates swapping so-called acid-forming foods like meat, fish, dairy, and grains with alkaline ones like fruits, nuts, beans, and vegetables.
The truth: The diet is based on the misleading idea that you can change your blood pH with food. While the pH of the stomach is acidic, the blood is slightly alkaline, something the food you eat can't change. Still, one positive part of the diet is that it advocates eating more fruits and veggies, something most dietitians agree we should all be doing.