Always a good idea to be careful if you're doing anything that isn't common sense with your diet. Keto has definitely hit fad status... amazing how many advertisements I see about it. GNC has a whole row of "Keto Supplements" for you to waste your money on. We have a friend who is a nutritionist, she thinks it's an insane diet to try without supervision/medical help. (She has patients on it) Sensible diet + activity levels shouldn't be so hard.. most of the fittest people you know eat plenty of carbs. But a good bit of exercise can offset a lot of food and they're often not eating as much as you'd think.