The Claim

A high-protein diet at 2.3 g/kg/day during 40% caloric restriction does not prevent the loss of fat-free mass in resistance-trained individuals, irrespective of training volume.

Source: A 4-week caloric restriction with high volume resistance-training and high-protein diet does not increase fat-free mass sparing but increases strength.

What the research says

Supports is higher

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

Supports
46score
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

When resistance-trained people reduce their calorie intake by 40% and eat 2.3 grams of protein per kilogram of body weight per day, they still lose fat-free mass, no matter how much they train.

See the scientific wording

A high-protein diet (2.3 g/kg/day) during a 40% caloric restriction does not prevent fat-free mass loss in resistance-trained individuals, regardless of training volume.

Why this might work

When the body burns more energy than it takes in, it shuts down muscle-building signals and turns on systems that break down muscle proteins for fuel, no matter how much protein is eaten or how hard someone trains.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: A 4-week caloric restriction with high volume resistance-training and high-protein diet does not increase fat-free mass sparing but increases strength.

    Even when strong people eat lots of protein and lift weights a lot during a very low-calorie diet, they still lose muscle — and lifting more doesn’t help stop it. The study shows protein and training volume didn’t protect muscle during extreme dieting.

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

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.