Qi Dai

September 12, 2025

Study shows magnesium inhibits colorectal cancer carcinogenesis by increasing vitamin D-synthesizing bacteria  

The findings from the current study suggest that magnesium also increases the gut synthesis of vitamin D, which does not go to the blood and takes effect locally.

By Tom Wilemon

January 7, 2021

Vitamin D activation and cancer risk

Vitamin D protection against colon cancer varies according to parathyroid hormone response, particularly among women.

By Paul Govern

March 26, 2020

Questions and answers on epidemiology of COVID-19

Though he specializes in chronic disease, epidemiologist Qi Dai, MD, PhD, professor of Medicine, has been closely following the international scientific literature on SARS-CoV-2 and the disease it causes, COVID-19 (coronavirus disease 2019).

By Paul Govern

December 14, 2018

Study shows magnesium optimizes vitamin D status

A randomized trial by Vanderbilt-Ingram Cancer Center researchers indicates that magnesium optimizes vitamin D status, raising it in people with deficient levels and lowering it in people with high levels.

By Tom Wilemon

October 18, 2017

Calcium intake and colorectal cancer

Calcium intake appears to protect against colorectal cancer in individuals with certain gene variants, Vanderbilt researchers have discovered.

By Leigh MacMillan

October 14, 2013

Magnesium impacts vitamin D status

Magnesium and vitamin D appear to work together to reduce risk of death from cardiovascular disease and colorectal cancer.

By VUMC News and Communications