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Carbohydrates, protein and fat are three macronutrients present in the typical human diet

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Carbohydrates, protein and fat are three macronutrients present in the typical human diet. Most nutritionists regard protein to be most satiating macronutrient, although it is hard to scientifically test this idea because controlling for all variables is very challenging. That said, we also do not know why protein is the most filling nutrient (see journal article here.

More protein in the diet helps a person reduce total food intake, hence weight loss programmes depend heavily on protein-based foods.

Animal products are best sources of protein as these can supply all essential amino acids to human body.