Analysis Version
v1
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causal
Analysis v1
Supported

Having more vitamin D in your body might help you build more muscle and store less fat, directing your body’s energy toward making lean tissue instead.

66
Pro
47
Against

Evidence from Studies

Supporting (2)

66

Community contributions welcome

61

A randomized study on the effect of vitamin D₃ supplementation on skeletal muscle morphology and vitamin D receptor concentration in older women.

Randomized Controlled Trial
Human
2013 Dec

This study gave older women extra vitamin D and found their muscles got bigger, which supports the idea that more vitamin D helps build muscle instead of storing fat.

14

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

Randomized Controlled Trial
Animal
2019 Aug

The study gave rats more vitamin D and found they grew more muscle and didn't gain more fat, which matches the idea that vitamin D helps build muscle instead of storing fat.

Contradicting (1)

47

Community contributions welcome

47

Vitamin D supplementation does not enhance resistance training-induced gains in muscle strength and lean body mass in vitamin D deficient young men

Randomized Controlled Trial
Human
2021 Jul

The study gave some men high doses of vitamin D while they worked out, but their muscles didn’t grow more than the men who took a placebo — so vitamin D didn’t help build more muscle as the claim says.

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Similar Assertions

If you have more vitamin D in your body, your body burns more calories while you're just sitting still—even if you don’t move more or eat differently.

51
0
84%

People who naturally have more vitamin D in their blood tend to grow taller as they develop, which might mean their bodies are more focused on building muscle and bone rather than storing fat.

0
0
82%

When you have more vitamin D in your body, your fat cells send out more of a signal called leptin, which tells your brain you’re full and don’t need to store more fat—so you might gain less fat over time.

0
21
78%

Taking vitamin D might help your body release a hormone that tells you when you're full and also stop a protein that blocks muscle growth, so you could feel more energized and build muscle more easily.

21
0
77%

In people who are overweight or obese, having more vitamin D in their body seems to be linked to how many calories they burn at rest, and this link happens because of how their body uses the vitamin D receptor gene — but not because of the PGC-1α gene.

46
0
77%

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