Vitamin D and metabolic
3 papers in the library, strongest Moderate.
Graded Moderate · Observational analysis of 7,520 older adults in two national cohorts, though it cannot show cause and supplementation was tested only in rats.
Papers 3
- Low Vitamin D Linked to Muscle Loss, Especially in People With DiabetesModeraten = 7,5202026The journal of nutrition, health & agingIn a study of over 7,500 older adults, low vitamin D was tied to higher odds of sarcopenia (age-related muscle loss). The link was stronger in those with diabetes. In aged diabetic rats, vitamin D3 supplements improved muscle strength and reduced fat buildup inside muscle fibers.
- Vitamin D Deficiency Tied to Higher Diabetes Risk in Older AdultsModeraten = 1,3242026Journal of diabetes and metabolic disordersAmong 1,324 adults over 60, about a quarter were vitamin D deficient and over half had either diabetes or prediabetes. Higher vitamin D levels were linked to lower odds of having worse blood sugar status. This is a snapshot study, so it cannot prove vitamin D causes the protective effect.
- Vitamin D Eased Fatty Liver and Blood Sugar Problems in Obese RatsPreliminary2026The Journal of nutritional biochemistryJunk food fed rats developed fatty liver, insulin resistance, and inflammation, much like people on a poor diet. Weekly vitamin D cut their food intake and weight gain, and improved blood sugar control and liver fat. It also calmed inflammation markers in the liver. This was rats, so it does not prove the same effect in people.
How this map is computed
A mark's size is the number of papers we hold on that pairing. It is a count, not a weighting by study design or sample size.
The fill shows the strongest grade in the cell. One Strong paper among four Preliminary ones still fills it dark, so open the cell to see the rest.
Grades and verdicts are assigned by a named person, never by counting.
An empty cell is a finding: nobody in our library has run that trial yet.