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What the heck are calories anyway

So the latest "fad" is calories. Every other person is talking about that as if it were the dreariest evil to have possessed humans. Even kids in Gymnasiums, Playgrounds and eventually Social Media, are tracking like pros. How cool is that? Really, that's bat-shit crazy. Rule of thumb being, understand and act and not to act what you do not understand. So here's a crash course. Calorie itself is a defunct unit of measurement of energy (heat really) and defined as the amount of heat required to increase the temperature of 1 gm of water by one degree (at one atm. pressure, but that's a separate topic). It's since been replaced by Joule but is still used widely in food industry.  Actually, what food industry calls a Calorie is really a KiloCalorie. A single small calorie is just too little energy to be of any significance. Considering that it was a unit of heat, it was actually calculated thus, by burning food to raise temperature of a Kg. of wat