is a calorie, a calorie, a calorie?

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Wight loss, for me, has been about math. My Daily RMR - 500 calories is a pound lost a week..

So I am thinking about those calories. Figure a Costco food court Cheese pizza slice has 700 calories. Eating the same caloric amount of Iceberg lettuce would be staggering.

So my question becomes are there "better" calories then others? Are peanut calories better for you then raisin calories?

Yes we need vitamin's, minerals, fiber etc. At the end of the day is it just another calorie to burn?

If anyone has any authoritative links on the subject, I would be interested. I am tired of googleing only to find akai berry info...

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