Celebrities Who Have Tried the Keto Diet The ketogenic diet involves eating plenty of fat and very few carbs, so that your body enters a fat-burning mode known as ketosis. There are a number of well-known stars who have committed to the diet. 1. Vinny Guadagnino: The 'Jersey Shore' cast member dropped 50 pounds. He shares advice on his @ketoguido Instagram account. 2. Halle Berry: The movie star has embraced the keto lifestyle for her figure and managing her diabetes. 3. LeBron James: The NBA mogul isn't a regular keto dieter, but he did cut weight when he tried eating keto in 2014. 4. Tim Tebow: The former NFL quarterback follows the keto diet. He eats plenty of avocado and even throws them in smoothies. 5. The Kardashians: Kourtney has followed the diet in the past, and Kim reportedly dropped 60 pounds after giving birth to her son Saint. 6. Vanessa Hudgens: The actress lost 10 pounds in a month preparing for her 'Women’s Health' cover by relying on the diet. 7. Adriana Lima: The Brazilian model revealed that she eats very few carbs and works out two hours a day prior to a Victoria’s Secret Fashion Show.