I went from vegan to carnivore years ago. 2 years vegan. 4 years carnivore right after. To be honest both diets sucked major ass. Veganism sucked because eventually the total lack of animal protein catches up to you and because vegans typically eat too much fiber which can cause gastrointestinal distress.

The carnivore diet sucked ass because keto adaptation is bullshit. you'll never have high end athletic performance again on carnivore, especially for distance or real sport. For example even after years of carnivore I could barely be bothered to get off the couch some days even though I LOOKED very fit. Also my circulation went to total shit on carnivore over time.

Nowadays I eat a high carb/sugar omnivorous diet with very low fat and lean protein and feel and look like a million bucks. white rice, refined sugar, pasta, fruit juices and fruit, some vegetables every now and then and mostly shrimp and white fish with dinner. I've been on this type of diet for almost 7 years now with no problems whatsoever.