The Claim

Twelve weeks of 20g/day protein supplementation has no effect on sleep quality in healthy older adults, as measured by the Pittsburgh Sleep Quality Index, irrespective of protein source.

Source: Impact of increased protein intake in older adults: a 12-week double-blind randomised controlled trial.

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.

Cause and effect
1 study reviewed
In plain English

Taking 20 grams of protein per day for 12 weeks does not change sleep quality in healthy older adults, regardless of whether the protein comes from milk, meat, or plants.

See the scientific wording

Twelve weeks of 20g/day protein supplementation does not improve sleep quality in healthy older adults, as measured by the Pittsburgh Sleep Quality Index, regardless of protein source.

Why this might work

Adding more protein to the diet does not change the levels of brain chemicals that control sleep, so sleep quality stays the same.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Impact of increased protein intake in older adults: a 12-week double-blind randomised controlled trial.

    This study gave older adults 20 grams of protein every day for 12 weeks—some got plant protein, some got dairy, and some got less. No group slept better than the others, so extra protein didn’t help sleep, no matter the source.

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.