 Additionally, the term "carb" or "carbs" refers to carbohydrates.Almost all diet plans are based on judicious distribution of these three elements in required ratios.For example, a 2000 calorie diet could consist of 800 calories from 200 grams of protein (1 g of protein = 4 kcal), 800 calories from 200 grams of carbs (1 g carbohydrates = 4 kcal) and 400 calories from 44 grams of fats (1 g fat = 9 kcal).