The most common unhealthy foods include highly-processed items such as fast foods and snack foods. That's because highly-processed foods tend to be low in nutrients (vitamins, minerals and antioxidants) and high in empty calories. This is because they contain high levels of unhealthy fats, sodium and sugar.

Whole grains (oats, brown rice and whole barley) Super starches (sweet potatoes) Fatty, cold-water fish (salmon, herring and sardines) Fruits (berries, avocados, tomatoes, pears, grapefruit and bananas)