GrassrootsHealth to honor vitamin D researchers at San Diego event

GrassrootsHealth will recognize three scientists on Nov. 2 in San Diego for research linking sunlight, UVB, vitamin D and cancer prevention. The event comes as much of the U.S. enters the season when winter sun may no longer generate enough vitamin D through skin exposure.

Why it matters: - GrassrootsHealth is using World Vitamin D Day to spotlight research that could shape how people think about cancer prevention, seasonal vitamin D status and sun exposure. - The timing matters because millions of Americans are entering the so-called vitamin D winter, when lower UVB levels can sharply reduce the skin’s ability to make vitamin D. - The event also aims to move decades of observational and clinical research into broader public awareness and practical use.

What happened: - GrassrootsHealth will honor Dr. Edward D. Gorham, Dr. William B. Grant and Dr. Joan M. Lappe on Nov. 2, 2026, at the inaugural Baggerly-Garland Awards Conference in San Diego. - The recognition is tied to research connecting sunlight, UVB exposure, vitamin D and cancer prevention. - The awards are named for Dr. Frank C. Garland and Carole Baggerly, with the conference taking place on World Vitamin D Day. - The event will be held at UC San Diego Cancer Center’s Goldman Auditorium in La Jolla, with in-person and virtual attendance options.

The details: - GrassrootsHealth says the “vitamin D winter” typically affects places at about 37°N latitude and above, especially from November through February. - Cities listed as affected include San Francisco, Denver, St. Louis, Washington, D.C., New York City, Chicago and Boston. - Research in Boston at 42°N found no detectable previtamin D3 production during those months under study conditions, even on cloudless days. - Dr. Edward D. Gorham’s work included a 1989 study of 20 Canadian cities that found breast cancer mortality was about 50% higher and colon cancer mortality twice as high in cities with the most sulfate air pollution versus the least. - Gorham and colleagues proposed that air pollution could reduce biologically effective UVB reaching the ground and limit vitamin D production. - Gorham’s later research in the former Soviet Union found higher breast cancer rates in northern regions and industrial areas with less sunlight. - Dr. William B. Grant published research in 2002 identifying additional cancers whose mortality rates were inversely associated with solar UVB exposure. - Grant later studied whether smoking, diet and other factors could explain those associations. - Two randomized controlled trials led by Dr. Joan M. Lappe, the late Dr. Robert P. Heaney and colleagues at Creighton University advanced the study of vitamin D in cancer prevention. - A later reanalysis of VITAL, a large randomized trial led by Harvard-affiliated researchers, found fewer metastatic and fatal cancers among participants taking vitamin D. - GrassrootsHealth says observational studies alone cannot prove causation, but laboratory research and studies measuring serum vitamin D metabolites provide additional supportive evidence. - GrassrootsHealth recommends three actions for World Vitamin D Day: learn seasonal UVB availability, know your serum 25-hydroxyvitamin D [25(OH)D] level, and practice sensible sun exposure. - The organization points readers to the free D-Minder app and the TEMIS Vitamin D UV Dose archive for UVB mapping and seasonal tracking. - GrassrootsHealth also says people can consider sensible sun exposure, diet, supplementation or FDA-cleared personalized UVB light therapy based on blood-test results. - For longer outdoor exposure, GrassrootsHealth advises clothing, a wide-brimmed hat or mineral-based broad-spectrum sunscreen to reduce sunburn risk. - The 2026 awards will recognize Gorham for epidemiological research on sunlight, UVB, atmospheric pollution and cancer; Grant for research on solar UVB, vitamin D and geographic disease patterns; and Lappe for randomized clinical trials on vitamin D, calcium and cancer prevention. - The awards are sponsored by Solius Labs in cooperation with GrassrootsHealth and the Helen Knoll Foundation. - GrassrootsHealth describes itself as a 501(c)(3) nonprofit public-health research organization focused on vitamin D research, education and advocacy. - The Helen Knoll Foundation says it supports young women through breast-health education and prevention.

Between the lines: - The conference frames vitamin D as a preventive-health issue, not just a nutrition question. - The awards also connect older geographic and epidemiologic findings with newer randomized-trial evidence, signaling an effort to unify a long-running scientific debate. - By highlighting winter UVB limits, GrassrootsHealth is pushing a seasonal message: sunlight alone may not be enough for vitamin D production in many U.S. locations for several months each year.

What's next: - GrassrootsHealth is inviting journalists, researchers, health professionals, cancer advocates and the public to attend the Nov. 2 conference in person or virtually. - The organization is also urging people to check seasonal UVB exposure, test vitamin D status and adjust sun, diet or supplementation decisions accordingly. - The event is positioned as an annualized public-facing milestone for the Baggerly-Garland Awards and for continued vitamin D advocacy.