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@arcana @hidden @scathach There are three types: Proteins, Carbohydrates, and Fats (Lipids.) All three provide caloric energy: proteins the least, carbohydrates in the middle and fats the most. This is why bad/ignorant diet advice generally tells you to avoid fats and eat a lot of protein. Doing that will imbalance your macronutrients and create awful problems all over the body (first thing you notice is constant shitting out of unmetabolosed proteins.)
Proteins are used for building the body. You need them to make new tissue, and to repair damaged tissue.
Carbohydrates are used for metabolising water. Too many carbs and not enough water? You're dehydrated. Too much water and not enough carbs? You're ALSO dehydrated! (Many such people will piss clear constantly but feel dehydration symptoms anyway.)
Fats are vital for a range of things but the first thing you'll notice if you cut them is constipation.
Most people should aim to have 20% of their daily caloric intake from proteins, 50% from carbohydrates and 30% from fats. If you want to build muscle, swap the fat and protein percentages.
Bear in mind what I said about calorie density at the start. An extreme example: a chicken breast has about as many calories as a large spoonful of olive oil. You don't need many fats to hit that 30%, and hitting 20% from protein can be challenging. Using a calorie tracker like the (disgustingly appish) MyFitnessPal is a must in the beginning.