Keep an eye on portions.

Keep an eye on portions.

You can eat all the broccoli and spinach you want, but for higher-calorie foods, portion control is the key. Check serving sizes on food labels—some relatively small packages contain more than one serving, so you have to double or triple the calories, fat, and sugar if you plan to eat the whole thing. Popular “100-calorie” food packages do the portion controlling for you (though they won’t help much if you eat several packages at once).