There are few things more miserable, albeit non-deadly, than a cold. I was sitting on my couch, nostrils taped open with a “Breathe right” strip, my achy body wrapped in an afghan. By then, I was feeling quite sorry for myself, blowing my nose, and tossing a heap of crumpled tissues into the waste basket.
As I cradled a steaming cup of tea in my hands, my phone rang. I glanced at the caller id.It was my Dad. I picked it up.
“Hello?” I hoarsely croaked into the receiver.
“Are you sick again?” My dad asked. “Haven’t you been taking Vitamin D?”
“I’ve been taking 2000 IU a day!” I protested.
“Hmmm,” he said. “Maybe you should take more.”
Vitamin D is probably one of the most underratedly awesome contributors to human health and well-being. It helps build bones, and regulate the immune system. (Aranow, 2011.) Vitamin D may also help prevent heart disease and play a role in preventing certain cancers. (Harvard School of Public Health). As a human living in a northern latitude (approx 42 deg N) during the wintertime, I am the first to admit that I am not up to synthesizing all my own Vitamin D from sunlight and/or food consumption.
Humans synthesize Vitamin D from sunlight when UVB rays hitting skin convert precursor 7-dehydrocholesterol into Vitamin D3. Vitamin D3 travels to the liver and kidneys, to be come an active form of Vitamin D (Source: Harvard Medical School, 2009)
One of the ways in which Vitamin D may boost the immune system is by activating t cells, the guardians of the immune system that spring into action when they detect “non-self” invaders (i.e. pathogens) in the body. Per 2010 research paper at the University of Copehagen, after t cells detect traces of foreign material, they must become “activated” in order to become sensitized and effective fight that specific germ. T cells send out a chemical signal that triggers production of the VDR protein. VDR brings Vitamin D into the t cell, “activating it to hunt down and bind to pathogens. TL;DR: Not enough Vitamin D? T cells will not be marshalled as quickly to fight nasty germs.
So what’s a winter-bound, higher-latitude-located human to do? I could ingest more food sources of Vitamin D, like the injured Viking chugging fish oil in the extremely entertaining historic skiing movie, The Last King. Getting naked outdoors in subfreezing temperatures for maximal epidermal sun exposure is a no-go. (Frostbite, possible arrest due to violation of public decency statues.) Also, my relatively high latitude geographic location (Michigan!) in winter would reduce the incident angle (and Vit D synthesizing effectiveness) of sun exposure.
(It probably doesn’t help that my melanin-deficient skin’s causes me to cover up even in summer. This is what I usually look like when I plan to spend any time outside even in warmer months. )
It looks like the Vitamin D tablets are my new best friends. P.S. Cold symptoms subsided after a weekend with tea, soup and self-pity. Also, probably Vitamin D.