Bear Grylls says he lost strength as a vegan, turned to organ meat

Bear Grylls, known for Man Vs. Wild, said on Instagram that he lost a lot of strength after five years of being vegan and fixed it by eating organ meats such as liver, heart and kidney. At 52, he says he feels fitter and stronger than 10 years ago. A dietitian explains the benefits, concerns, and whether a planned vegan diet can work.