mathematical illiteracy. age height activity level= calories per day  they never did the math and eat more calories per day than necessary for age height activity level. if they are within that level or less they would be skinny.  it's extremely simple and there are apps that do all the calculations for you. calories and servings are listed on every packaged food. it's wholly ignored. a serving of cheerios is 1.5 cups at 140 calories, a 6in banana 90, whole milk 149c. instead, ignore math and pour in bowl until full and milk until the cereal rises up and then pour sugar on it and skip the banana. a fully loaded blooming onion is almost 2000 calories. but nobody pays attention. every single calorie is available for any foodstuffs but that's inconvenient.
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