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* Make greater allowances for the cold, wearing more clothing than you'd usually need.
* Don't rely on sunscreen, which does not block all the UV<ref name="VirosSanchez-Laorden2014"/> and their safety is unclear<ref>[http://drmirkin.com/morehealth/sunscreens.html Dr. Gabe Mirkin, Sunscreen]</ref>
'''Prevention'''
* Be careful to avoid sunburn, covering up with UV resistant fabrics.
<ref name="Imodium"> Imodium ([http://en.wikipedia.org/wiki/Loperamide Loperamide]) is an anti-diarrhea mediation, but it works by slowing the progress of material through the digestive tract. Some runners find this makes the problem worse, acting like a cork.</ref>
<ref name="fat">Low fat availability is less well researched than low blood sugar/[[Glycogen]] depletion, but there is some anecdotal evidence that ultrarunning can deplete the available fat sources. This is not to say that you run out of body fat, just that you can't mobilize those fat stores quickly enough, combined with depleted intramuscular triglycerides.</ref>
<ref name="VirosSanchez-Laorden2014">Amaya Viros, Berta Sanchez-Laorden, Malin Pedersen, Simon J. Furney, Joel Rae, Kate Hogan, Sarah Ejiama, Maria Romina Girotti, Martin Cook, Nathalie Dhomen, Richard Marais, Ultraviolet radiation accelerates BRAF-driven melanomagenesis by targeting TP53, Nature, volume 511, issue 7510, 2014, pages 478–482, ISSN [http://www.worldcat.org/issn/0028-0836 0028-0836], doi [http://dx.doi.org/10.1038/nature13298 10.1038/nature13298]</ref>
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