Why should I avoid extreme temperature environments while on ProLon®? 20 February 2023 17:06 Updated Extreme hot temperatures should be avoided as this may increase the risk of fainting. Related articles Do you experience ketosis while on ProLon®? Will I lose muscle mass while I am on this programme? Can I extend the fast? What is the recommended healthy or normal daily caloric intake? What are the potential side effects of ProLon®?