StabMeReapers I was a bit the same when my teenage dc (several years ago) decided to be vegetarian. Me: "OK, but you have to eat vegetables" My 'vegetarian' friend ate cereal and toast for breakfast, sandwich and crisps for lunch, tea might be a pizza - with a smear of tomato and a couple of slices of mushroom. That's not a vegetarian diet, its a carbohydrarian diet.
@Ketomeato bulletproof coffee, also known as butter coffee, is essentially coffee blended with butter (or coconut oil if you're vegetarian). That classic 'bulletproof' has butter plus MCT oil (medium-chain triglycerides).
It is a way to make your coffee 'creamy' without adding milk or cream. It can be a great way of getting fat into your diet, especially early in the day if you are doing some kind of time-restricted eating. Some people swear by the combination of high fat and caffeine as a 'brain food'...
My first mistake was to add a dod of butter to my black coffee, and stir. It was just coffee with a pile of grease on it. Then I learned to whizz it with the blender (with or without extra cream). Blending it emulsifies the fats in the butter and honestly you'd not know that it wasn't some kind of creamy latte..