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As others have noted, nutrition education and fresh-food availability aren't as easy to come by as they should be. And if you grow up not knowing this information, it's easy to develop bad eating habits and gain weight in a short amount of time.
I find that nearly impossible to believe anymore. 30 years ago perhaps, but despite all the "fat bad-carbs good, no wait! carbs bad-fat OK, no wait! some carbs and fat good-sugar bad, no wait!..." messages, the one constant message has always been: consume fewer calories. This message has never changed, not one bit.
You can't tell me that parents feeding their children soda and Cheetos still haven't heard that the more calories you consume, the bigger you will be. This information is *everywhere*. Even the nutrition labels on the back of a pack of cookies has the most basic information possible: calories per serving, and the number of servings in the package. The information is on everything we purchase, literally in black and white.
What's the disconnect?