#1 Leafy greens
Medical experts call them one of nature's miracle foods. Leafy greens like Swiss chard and kale are high in nutrients like folate and vitamins A and C that can lower your risk of cancer. Just one cup of dark, leafy greens a day could also prevent diabetes and high blood pressure.

#2 Nuts
Many nutritionists recommend nuts like almonds, cashews and walnuts because they're high in natural fiber. Fiber slows your digestive process, keeping hunger and unhealthy mid-afternoon snacks at bay. Goodbye vending machine runs!

#3 Onions
Studies show that consuming onions on a regular basis may reduce symptoms of asthma and the risk of developing stomach cancer. Add them to soups and stir-fry, and just remember -- the stronger the onion, the greater the health benefit.

#4 Whole grains
Refined grains, like white rice and pasta, have lost 90% of their nutritional value through the refining process. As if that weren't reason enough to choose whole grains like brown rice, quinoa and whole oats, a recent study showed that a diet rich in whole grains actually flattens your belly by reducing fat storage in your lower abdominal region.

#5 Yogurt
Making yogurt part of your daily eating routine can improve your digestion -- if you're buying the right stuff. Check that the label lists "active cultures" to make sure you're getting healthy probiotics, and pick a yogurt rich in vitamin D to prevent osteoporosis.