Air-popped popcorn is one of the healthiest snacks around, full of fiber and low in calories.
Tod Marks with Consumer Reports warns, "But the minute you soup it up, with sugar, with salt, with cheese, that's when you run into a problem and you take a healthy snack and you render it unhealthy."
Peanut butter is good-for-you food. It's mostly peanuts and it's loaded with protein. But Jif has come out with Hazelnut Chocolate to spread on your bread. Check the label. The leading ingredients are sugar and vegetable oil and it provides far less protein than peanut butter.
White turkey and chicken meat are some of the best sources of low-fat protein. But if you buy it packaged, like this Oscar Mayer Oven Roasted Turkey Breast, watch for added sodium. Just two ounces has 510 milligrams - 21 percent of the daily limit.
Lowfat yogurt is another healthful food. But look out if it's topped with chocolate balls or cookie crumbles. This yogurt has 26 grams of sugar and 6 grams of fat.
And beware of packaged smoothies, even if they make lots of healthy claims.
Tod explains, "This is what it's called. But this is what it is. When you read the nutrition facts label you find out it actually is about 500 calories per bottle, and 34 grams of sugar!"
You're better off making your own smoothies, or topping your yogurt with fresh fruit. You can control the sugar and keep those foods that are good for you … good for you!
Consumer Reports says something else to be wary of at the supermarket - veggie chips. They are often made of potato flour and can have as much fat and sodium as potato chips.