The IOM calculated an acceptable macronutrient distribution range for carbohydrate (45%-65% of energy), protein (10%-35% of energy), and fat (20%-35% of energy; limit saturated and trans fats).
Also question is, what is the best macro ratio for health?
Most macro ratios follow the acceptable macronutrient distribution range (AMDR), a scale determined by the Food and Nutrition Board of the Institutes of Medicine (IOM). For optimal health, the average person needs an AMDR with 45 to 65 percent carbs, 10 to 35 percent protein, and 20 to 35 percent fat.