The Claim

In female weanling Sprague-Dawley rats, a higher dietary intake of vitamin D (4 IU/g) is associated with a smaller decline in serum IGF-1 levels over an 8-week period compared to a lower dietary intake of vitamin D (1 IU/g).

Source: Lean body mass accretion is elevated in response to dietary vitamin D: A dose-response study in female weanling rats.

What the research says

Supports is higher

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

Supports
14score
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

When baby female rats get more vitamin D in their food, their body keeps more of a growth-related hormone called IGF-1 over 8 weeks, compared to rats getting less vitamin D.

See the scientific wording

In female weanling Sprague-Dawley rats, higher vitamin D intake (4 IU/g) is associated with a smaller decline in serum IGF-1 over 8 weeks compared to lower intake (1 IU/g).

What the research says

1 study

  1. Study: Lean body mass accretion is elevated in response to dietary vitamin D: A dose-response study in female weanling rats.

    Rats that got more vitamin D in their food lost less of a growth hormone (IGF-1) over time than rats that got less vitamin D — exactly what the claim says.

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.