The Claim

In young, healthy men, a 40% energy deficit over 10 days reduces integrated muscle protein synthesis by approximately 10–20%, and this reduction is attenuated by higher protein intake and resistance exercise, indicating systemic anabolic suppression during acute calorie restriction.

Source: Pronounced energy restriction with elevated protein intake results in no change in proteolysis and reductions in skeletal muscle protein synthesis that are mitigated by resistance exercise

What the research says

Supports is higher

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

Supports
60score
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.

How it works
1 study reviewed
In plain English

In young, healthy men, a 40% reduction in calorie intake for 10 days lowers muscle protein synthesis by 10–20%. This reduction is smaller when protein intake is higher or when resistance exercise is performed, showing that energy restriction directly suppresses muscle-building processes.

See the scientific wording

In young, healthy men, a 40% energy deficit over 10 days reduces integrated muscle protein synthesis by approximately 10–20% regardless of protein intake, but this reduction is less pronounced with higher protein consumption and resistance exercise, indicating that systemic anabolic suppression occurs during acute calorie restriction.

Why this might work

When the body has much less energy than usual, it slows down the process of building muscle proteins by turning off a key signaling switch called mTORC1. This switch normally tells the cell to start making proteins using amino acids. Eating more protein alone does not fully restart this switch, but lifting weights creates physical tension in muscles that reactivates the switch, allowing protein building to continue even when energy is low.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: Pronounced energy restriction with elevated protein intake results in no change in proteolysis and reductions in skeletal muscle protein synthesis that are mitigated by resistance exercise

    When young men ate 40% fewer calories for 10 days, their muscles made less protein, but eating more protein and lifting weights helped lessen that drop.

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

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