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Functional foods are hitting the grocery store shelves in droves, and this should cause you some concern, because what it means is that companies are tossing some vitamins, minerals, antioxidants and fiber into many not-so-good-for-you foods and then calling them healthy. But just because your Fruit Loops box says "now added with fiber" doesn't mean they're nutritious.

Functional foods are really just junk in disguise, says FitSugar, and many of them, while claiming to be packed with wholesome goodness, still contain lots of sugar, corn syrup, sodium and even trans fat.

You'd be wise to focus on a diet full of vegetables, fruits, whole grains, healthy fats and lean proteins. It's really all you need. Well, that, and a good amount of exercise.

Try working out with some friends, and it could make you plenty happy.