Fats are one of the three main macronutrient groups in human diet, along with carbohydrates and proteins, [1][3] and the main components of common food products like milk, butter, tallow, lard, salt Ò€¦ The american heart association suggests that 8-10 percent of daily calories should come from polyunsaturated fats, and there is evidence that eating more polyunsaturated fatÒ€up to 15 percent of Ò€¦ Learn what dietary fats do for the body and how much fat is recommended per day.