One rarely mentioned partial reason for the explosion of obesity is that nowadays we almost all have central heating and are rarely in situations which necessitate "wrapping up" warmly. The body is a heat engine and we have reduced the heat loss thereby reducing the amount of fuel (food) we need to burn to maintain body temperature. If I could be bothered, I'd write a paperback book expanding this basic idea to two hundred pages and have a best seller on my hands (and contribute towards solving global warming too!).

EAT LESS FOOD! --- EXERCISE BRISKLY!! --- TURN DOWN THE HEAT!!!

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