How We Build a Calorie and Macro Plan From Lean Mass

Most calorie calculators start with your weight, your age and a guess about how active you are. The problem is that two people who both weigh 200 pounds can be built very differently. One might carry 160 pounds of lean mass, the other 120. Their needs are not the same, and a plan built on total weight will overfeed one and underfeed the other.

So we start with lean mass instead. Lean mass is everything that is not fat: muscle, organs, bone and water. It is the tissue doing most of the metabolic work, and it is what we are trying to protect or build.

The formula

Once we know your lean mass in pounds, call it X, the plan comes from three rules:

• Protein = X grams per day
• Carbohydrate = 1 to 2 times X grams per day, with 1.5 as our default
• Fat = 25% of total calories

Calories are not set first. They are the result of the other three.

Here is a worked example. Say a scan shows 140 pounds of lean mass.

• Protein is 140 grams, which is 560 calories (protein has 4 calories per gram)
• Carbohydrate at 1.5 times is 210 grams, which is 840 calories
• Those two together are 1,400 calories, and they make up 75% of the plan
• So total calories are about 1,870, and fat is the remaining 25%, about 470 calories, or roughly 52 grams

Why carbs move and protein does not

Protein stays at 1 gram per pound of lean mass because that is a generous target for keeping and building muscle, and it covers a wide range of training. We spread it across 3 to 4 meals of 30 to 50 grams, because muscle protein synthesis responds well to several solid doses through the day.

Carbohydrate is the adjustable piece. Someone training hard most days, or trying to gain muscle, may sit near 2 times lean mass. Someone who is less active, or focused on losing fat, may sit closer to 1 times. In the example above, that single change moves total calories from about 1,490 to about 2,240 a day. Fat follows along at 25% of calories, so it scales with the plan and does not fall too low.

Why the scan matters

This plan is only as good as the lean mass number it starts from. An InBody scan gives that number in about a minute, standing on the device with a small current running through your hands and feet. Because lean mass changes as you train, we repeat it about monthly. If lean mass goes up, protein and carbs go up with it, and the plan stays matched to the body you actually have.

That's the kind of thing we measure before we tell anyone how much to eat.

Book an InBody scan at HYBRD Health ($39)

This article is educational and is not medical advice.