[WATCH]: 5 of 5 Diet wars - Low fat vs low carb

tinyurl.com -- People put on weight when they take in more calories than they burn. If you think of food as fuel, the energy content of the fuel is measured in calories. A slice of bread, for example, has about 100 food calories. If you were to add up all the calories you consumed in a day -- breakfast, lunch, dinner and snacks -- that's your energy input. Your body uses this energy for everything from breathing to moving around. Everyone is different, but over the course of a day, an "average" man expends something like 1800 calories and an "average" woman around 1500 calories. Jon Palfreman is the producer of "Diet Wars." It turns out that even a slight energy imbalance will, over time, have consequences. Eating only 50 calories a

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