Protein

Definition

Dietary protein provides the amino acids your body uses to build and repair tissue, along with about 4 calories per gram of energy. It comes from meat, fish, eggs, dairy, legumes, soy, and in smaller amounts from grains and vegetables.

In tracking apps protein usually gets its own progress ring because it is the macro people most often fall short of once calories come down.

The reference numbers

The Dietary Reference Intakes set the RDA at 0.8 g per kg of body weight — for a 70 kg adult, 56 g per day — and place protein's Acceptable Macronutrient Distribution Range at 10–35% of total energy.

Worked through: that same 70 kg adult eating 2,000 calories has an AMDR window of 200–700 calories from protein, which is 50–175 g. So a 120 g target sits comfortably inside the published range at 24% of energy, while an 1,800-calorie day built around 200 g of protein (800 calories, 44%) would sit outside it.

The mistake people make

Reading the RDA as an optimum. It is a floor set to meet the needs of nearly all healthy adults, not a ceiling or a recommendation for people training hard — which is exactly why the AMDR spans a much wider band.

The opposite error is treating more as always better. Protein calories still count toward the day, so grams added at the top come out of carbohydrate and fat somewhere, and specific intakes for kidney or liver conditions belong with a clinician, not a calculator.

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