Every food that provides calories does so through one or more macronutrients:
- Protein provides 4 kcal/g and is the primary structural material for muscle, organs, enzymes, and immune proteins.
- Carbohydrate provides 4 kcal/g and is the body’s preferred quick-access fuel, particularly for the brain and during intense exercise.
- Fat provides 9 kcal/g, supports fat-soluble vitamin absorption, cell membrane integrity, and hormone production.
Alcohol provides 7 kcal/g but is not a nutrient.
For Indian adults, the ICMR-NIN Dietary Guidelines for Indians 2024 “My Plate for the Day” allocates cereals to no more than 45 % of total energy, with the remaining carbohydrate (taking total carbohydrate to roughly 50–55 %) coming from pulses, vegetables, fruit, and milk; protein at 10–15 %; and total fat at no more than 30 % (with visible fat capped at 20–30 g/day for sedentary–moderate adults). These ranges are broad because optimal ratios vary with health goals, activity level, age, and clinical conditions. Rather than tracking macros precisely, focusing on food quality within these ranges — wholegrains and millets, dal and pulses, lean protein, healthy fats — achieves most of the same benefits with far less burden.