Ideally keto should be a high fat diet; because your body is burning fat for energy instead of carbs the majority of your calories should come from fat, if you don't eat enough you just feel lethargic and awful. But a lot of fatties seem to think it's a magical diet that's just going to immediately slim them down with the least amount of effort possible so they don't even need to count their calories. Which is bizarre as it's one of the most awkward diets imaginable, especially if anyone invites you out to eat anywhere. Personally, I think bulletproof coffee is revolting.