Why should I avoid extreme temperature environments while on ProLon®? 22 February 2022 07:40 Extreme hot temperatures, should be avoided as this may increase the risk of fainting. Related articles Do you experience ketosis while on ProLon®? What are the potential side effects of ProLon®? Will I lose muscle mass while I am on this program? Can I extend the fast? Can I do ProLon® if I’m pregnant?