Effects of vitamin D and/or calcium intervention on sleep quality in individuals with prediabetes: a post hoc analysis of a randomized controlled trial.

What Was Tested

The paper reports a study of Vitamin D, K2, Magnesium and Zinc, published as a randomized controlled trial.

The aim of this study was to evaluate the effects of vitamin D and/or calcium supplementation on sleep quality in individuals with prediabetes.

The Pittsburgh Sleep Quality Index (PSQI) was used as the primary outcome to assess sleep quality.

Why It Was Studied

The trial was registered in August 2019 as ChiCTR190002487.

Who Took Part

By PubMed's age tags, the people studied were adults, middle-aged adults and older adults, both men and women.

Questionnaires and fasting blood samples were collected at baseline and post-intervention for demographic assessment and correlation index analysis.

How the Study Was Run

The design is described as randomized, double-blind and placebo-controlled.

Because people in this Vitamin D, K2, Magnesium and Zinc study were split into groups at random, differences between the groups are less likely to reflect who happened to join each one.

Neither the participants nor the staff measuring them knew who was on Vitamin D, K2, Magnesium and Zinc, so expectations could not easily colour the readings.

The comparison arm used a placebo, so changes seen with Vitamin D, K2, Magnesium and Zinc could be set against what happens without it.

A 24-week randomized controlled trial (RCT) was conducted in a 212 Chinese population with prediabetes.

What Was Measured

PubMed files the paper under topics including Prediabetic State, Vitamin D, Sleep Quality, Dietary Supplements, Calcium, Dietary, China and Vitamins.

The authors tagged it with the keywords Prediabetes and Trial.

What This Means in Plain Language

The paper is a randomized, double-blind and placebo-controlled study of Vitamin D, K2, Magnesium and Zinc.

The abstract goes on to report its results in about 4 sentences; this page does not restate them, so read the paper for the findings and their limits.

The publication is from 2024 (European journal of nutrition), a journal based in Germany.

More context: the Vitamin D, K2, Magnesium and Zinc compound page, all human trials.