Scarcity of food and cold weather have accompanied us and constituted serious threats to our survival for the entire duration of our species' history. Fortunately, there are two tissues selected by nature to help us deal with these difficulties – they are the white (WAT) and brown (BAT) adipose tissue. While WAT helps us buffer for fluctuating energy availability BAT will keep us warm at least during our first days of extra-uterine life and, as will be discussed herein, most likely also be of importance to us for longer than that. The BAT-organ is unique in that it has evolved to safely dissipate large amounts of chemical energy as heat – a quality that might be harnessed to enhance human energy expenditure and together with fundamental life style changes help us deal with a dangerously hyper-caloric environment and still remain in good health.