What goes in

"What goes in" is everything you eat and drink. Humans, like bears and raccoons, are omnivores—we can eat just about anything, and as long as we get a reasonable variety, we'll be O.K. You don't see a 'coon stalking away from an overturned garbage can because the contents are low in calcium, nor a bear turning up his nose on finding the sandwiches in your picnic basket aren't made with the latest trendy low-sodium lecithin-enriched oat bran bread. There's no reason you should be obsessive about food either. Since we're efficient food processing machines, it's possible to reduce all the complexity of food so a single number that gives the total energy the body can extract from it—the calorie. The essential thing you need to know about what goes in is the total number of calories you eat in a day. All the rest are minor details.

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