Higher Maternal Body Mass Index Attenuates the Response to High-Dose Vitamin D Supplementation During Pregnancy: A Secondary Analysis of the Randomized Vitamin D Antenatal Asthma Reduction Trial (VDAART).

What Was Tested

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

Vitamin D supplementation during pregnancy is recommended to optimize maternal vitamin D status, yet biochemical response is highly variable, potentially limiting attainment of adequate 25-hydroxyvitamin D [25(OH)D] concentrations.

Maternal body mass index (BMI) may modify vitamin D response, but this relationship has not been comprehensively examined in randomized trials conducted during pregnancy.

Who Took Part

By PubMed's age tags, the people studied were adults, women only.

Maternal serum 25(OH)D was measured at enrollment (10‒18 wk) and in the third trimester (32‒38 wk).

Linear mixed-effects models examined the interaction between treatment group and BMI (categories <25, 25‒29.9, and ≥30; continuous; and ordinal), adjusting for baseline 25(OH)D and demographic and clinical covariates.

How the Study Was Run

The researchers set it up as a randomized and double-blind study.

Random assignment meant chance, not the researchers, decided who got Vitamin D, K2, Magnesium and Zinc and who got the comparison, which limits bias.

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.

What Was Measured

The subject headings attached to it are Vitamin D, Body Mass Index, Dietary Supplements, Asthma, Pregnancy Complications and Vitamin D Deficiency.

Author keywords: 25(OH)D, body mass index (BMI), effect modification, obesity and vitamin D, pregnancy and nutrition and vitamin D supplementation.

What This Means in Plain Language

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

The abstract goes on to report its results in about 9 sentences; this page does not restate them, so read the paper for the findings and their limits.

The publication is from 2026 (The Journal of nutrition), a journal based in United States.

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