The Claim

In young overweight men undergoing a 40% energy deficit and performing six days per week of combined resistance and high-intensity interval training, consuming 2.4 g of protein per kilogram of body weight daily for four weeks results in a 1.2 kg increase in lean body mass, which is significantly greater than the 0.1 kg change observed with 1.2 g/kg/day protein intake.

Source: Higher compared with lower dietary protein during an energy deficit combined with intense exercise promotes greater lean mass gain and fat mass loss: a randomized trial.

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
78score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Cause and effect
1 study reviewed
In plain English

Young overweight men who eat 2.4 grams of protein per kilogram of body weight daily while in a 40% calorie deficit and doing six days per week of strength and high-intensity interval training gain 1.2 kilograms more lean body mass over four weeks than those eating 1.2 grams per kilogram per day.

See the scientific wording

In young overweight men undergoing a 40% energy deficit and performing six days per week of combined resistance and high-intensity interval training, consuming 2.4 g of protein per kilogram of body weight daily for four weeks resulted in a 1.2 kg increase in lean body mass, significantly greater than the 0.1 kg change observed with 1.2 g/kg/day protein intake, suggesting higher protein intake can promote lean mass accretion during caloric restriction when paired with intense exercise.

Why this might work

When a person eats a lot of protein while losing weight and doing intense workouts, the amino acids from the protein, especially leucine, turn on a cellular switch that tells muscle cells to build more protein. The workouts make the muscle cells more sensitive to this signal. Even though the body is in a calorie deficit, the increased protein production outpaces breakdown, so muscle mass grows.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Higher compared with lower dietary protein during an energy deficit combined with intense exercise promotes greater lean mass gain and fat mass loss: a randomized trial.

    When overweight men eat a lot less food but work out hard six days a week, eating more protein (2.4 grams per kg of body weight) helps them gain muscle, while eating less protein (1.2 grams per kg) barely helps at all.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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