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Vitamin D Status clinical trials

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NCT ID: NCT06241976 Recruiting - Clinical trials for Hyperglycemia, Postprandial

Diabetes Risk in East London and Its Association With Vitamin D by Ethnic Group (DELVE)

DELVE
Start date: December 12, 2023
Phase: N/A
Study type: Interventional

The goal of this study is to investigate the relationship between vitamin D status and a diabetes risk factor, postprandial glycaemic response in White, South Asian and Black African Caribbean populations in East London. The main question[s] it aims to answer are: - Are there differences in postprandial glycaemic response to a sugar water drink or orange juice between White, South Asian and Black African Caribbean people in East London? - Is there a relationship plasma 25(OH)D and the postprandial glycaemic response to a sugar water drink or orange juice consumption? - What are the knowledge and perceptions of vitamin D intake between White, South Asian and Black African Caribbean people in East London? - Is there a difference in dietary vitamin D intake between the three ethnic groups? Participants will make two visits to the lab, approximately 2.5 hours each. The order of the two drinks will be randomized via Excel Random function. For each visit, the blood sugar levels will be measured at fasting (0) and every 30 minutes up to 2 hours postprandially (5 times total) using a finger prick. At baseline only (visit 1), participants will fill out a knowledge and perception survey, provide a 4-day estimated food diary, provide a 7 ml blood sample via phlebotomy, and have their height, weight and body fat percentage measured.

NCT ID: NCT03132103 Recruiting - Vitamin D Status Clinical Trials

Vitamin D Supplementation and Immunity/Physical Performance

Start date: January 6, 2016
Phase: N/A
Study type: Interventional

The purpose of this study is to examine the effect of vitamin D supplementation on vitamin D status, immunity and physical performance.