Check out these Power foods

Broccoli

Why It's Healthy:

-- One medium stalk of broccoli contains more than 100 percent of your daily vitamin K requirement and almost 200 percent of your recommended daily dose of vitamin C -- two essential bone-building nutrients.

-- The same serving also helps stave off numerous cancers.

Quick Tip:

Zap it! Preserve up to 90 percent of broccoli's vitamin C by microwaving. (Steaming or boiling holds on to just 66 percent of the nutrient.)

Dark Chocolate

Why It's Healthy:

-- Just one-fourth of an ounce daily can reduce blood pressure in otherwise healthy individuals.

-- Cocoa powder is rich in flavonoids, antioxidants shown to reduce "bad" LDL cholesterol and increase "good" HDL levels.

Quick Tip:

A dark chocolate bar contains about 53.5 milligrams of flavonoids; a milk chocolate bar has fewer than 14.

Salmon

Why It's Healthy:

-- A great source of omega-3 fatty acids, which have been linked to a reduced risk of depression, heart disease, and cancer.

-- A 3-ounce serving contains almost 50 percent of your daily dose of niacin, which may protect against Alzheimer's disease and memory loss.

Quick Tip:

Opt for wild over farm-raised, which contains 16 times as much toxic polychlorinated biphenyl (PCB) as wild salmon.

Walnuts

Why They're Healthy:

-- Contain the most omega-3 fatty acids, which may help reduce cholesterol, of all nuts.

-- Omega-3s have been shown to improve mood and fight cancer; they may protect against sun damage, too (but don't skip the SPF!).

Quick Tip:

Eat a few for dessert: The antioxidant melatonin, found in walnuts, helps to regulate sleep.

Spinach

Why It's Healthy:

-- Spinach contains lutein and zeaxanthin, two immune-boosting antioxidants important for eye health.

-- Recent research found that among cancer-fighting fruits and veggies, spinach is one of the most effective.

Quick Tip:

Spinach is a healthy -- and flavorless -- addition to any smoothie. You won't taste it, we promise! Try blending 1 cup spinach, 1 cup grated carrots, 1 banana, 1 cup apple juice, and ice.

Beans

Why They're Healthy:

-- Eating a serving of legumes (beans, peas, and lentils) four times a week can lower your risk of heart disease by 22 percent.

-- That same habit may also reduce your risk of breast cancer.

Quick Tip:

The darker the bean, the more antioxidants it contains. One study found that black bean hulls contain 40 times the amount of antioxidants found in white bean hulls.