The Claim

A 12-week calorie-restricted diet providing 20 grams of Prolibra™ whey protein daily reduces the carbohydrate-to-protein ratio from 3.6:1 to 2.4:1, which is associated with a fat-to-lean mass loss ratio of 3.75:1, compared to a control group maintaining a 3.6:1 carbohydrate-to-protein ratio with a fat-to-lean mass loss ratio of 1.05:1.

Source: A whey-protein supplement increases fat loss and spares lean muscle in obese subjects: a randomized human clinical study

What the research says

Supports is higher

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

Supports
71score
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.

Correlation
1 study reviewed
In plain English

Over 12 weeks, a calorie-restricted diet with 20 grams of Prolibra™ whey protein daily changes the ratio of carbohydrates to protein from 3.6:1 to 2.4:1, resulting in a fat-to-lean mass loss ratio of 3.75:1, while a control group with no change in ratio lost fat and lean mass at a 1.05:1 ratio.

See the scientific wording

A 12-week calorie-restricted diet with 20 grams of Prolibra™ whey protein daily reduces the carbohydrate-to-protein ratio from 3.6:1 to 2.4:1, which is associated with a 3.75:1 fat-to-lean mass loss ratio, compared to 1.05:1 in a control group maintaining a 3.6:1 ratio.

Why this might work

When a person eats less food but gets extra whey protein, the high leucine in the protein tells muscle cells to stop breaking down and start building more protein. At the same time, the protein lowers insulin and cortisol levels, which stops the body from storing fat and instead forces it to burn fat for energy. This causes more fat to disappear while muscle stays intact.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: A whey-protein supplement increases fat loss and spares lean muscle in obese subjects: a randomized human clinical study

    When obese people ate fewer calories but took a special whey protein supplement, they lost more fat and kept more muscle than those who took a plain drink — even though both groups ate the same number of calories. The protein helped them lose fat instead of muscle.

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.

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