10 Nuts With Super-Healing Powers

Think that handful of mixed nuts is just empty calories? Think again: Nuts are nutritional powerhouses, packed with fiber, protein, good fats, and key vitamins and minerals.

Trouble picking a favorite nut? Turns out that's not necessary.

"Some nuts get the spotlight more than others, but I don't think we should be exclusionist," said Beth Reardon. "If we favor one nut over another, we're missing out."

The solution? Mixed nuts -- one ounce, or about a small handful, per day, according to Reardon. Here are ten varieties you'd be nuts not to add to the mix.

1. Pistachios

Pistachios have a lot going for them -- a pretty green hue, a distinctive sweet taste, and a whole lot of health benefits.

Superpowers: A 2012 study showed that pistachios can reduce bad LDL cholesterol by up to 6 percent, which helps the arteries stay healthy and clear of plaque.

Pistachios are also a great source of gamma-tocopherol, a particular form of vitamin E, and may therefore help prevent certain types of cancer, Parkinson's disease, and Alzheimer's. They have a high amount of potassium, which keeps cells healthy, plus lutein and zeaxanthin, which promote eye health. Pistachios also contain high levels of antioxidants, which help keep cells safe from dangerous free radicals.

Power boost: Buy pistachios with their shells on. Behavioral eating studies have shown that shelling pistachios yourself and leaving the shells where you can see them might help you feel more satisfied with fewer calories.

Also, pistachios can reduce spikes in blood sugar after a carb-heavy meal, according to a 2011 study, so consider adding some to your next pasta dish for a satisfying crunch and extra nutritional benefit.

2. Almonds

If you ask a personal trainer what her favorite nuts are, they're probably sweet, protein-packed almonds, which help people stay full and energetic between meals. The specific balance of carbohydrates in almonds also makes almond flour a great flour substitute for people who have trouble eating wheat -- make it at home by buzzing almonds in a food processor.

Superpowers: Want to lose weight? Try eating almonds. A 2003 study showed that people who ate almonds instead of other complex carbs lost weight and reduced their waist sizes. Like pistachios, almonds can lower cholesterol levels and reduce blood sugar spikes after eating, and a 2008 study showed that almonds can also reduce insulin secretion, which can protect against cardiovascular disease and diabetes.

What's more, almonds are another great source of vitamin E, which can help protect cells from free radicals.

Power boost: If possible, eat almonds with their skins on. Almond skins contain many different antioxidants, including 20 flavonoids that could be responsible for almonds' positive effects on cholesterol levels and heart health.

3. Walnuts

Walnuts are the world's healthiest nut -- at least according to Joe Vinson, a researcher at the University of Scranton in Pennsylvania. Throw some in chocolate chip or oatmeal-raisin cookies, or add them to a salad or a bowl of cereal.

Superpowers: Walnuts may help prevent or slow the progression of Alzheimer's. A 2010 study showed that mice with Alzheimer's showed improvements in memory, learning ability, and motor development when walnuts were added to their diet.

In a 2012 study, walnuts were shown to inhibit the growth of cancerous tumors in mice.

Feeling a little bloated and moody? Walnuts might help with that too -- they're a great source of manganese, a trace mineral that's been shown to reduce symptoms of PMS.

Walnuts are an excellent source of alpha-linolenic acid, one of the essential fatty acids that we have to get from our diet and that may help ease anxiety, depression, and stress.

Walnuts also contain melatonin, a powerful hormone that helps regulate sleep cycles. Melatonin may also play a role in preventing cancer, quieting sundown syndrome in people with Alzheimer's, and treating other conditions, like migraines and irritable bowel syndrome.

Power boost: To get the full benefit of walnuts, make sure to buy them at a store with a high turnover, and store them in the fridge or freezer after a few days. (If they're in a sealed plastic bag or container, they should keep up to two years in the freezer.) The reason: Like many other nuts, shelled walnuts can go rancid easily due to their high fat content.

4. Cashews

These curved kernels come from South America and other tropical areas. Salty and sweet, they're great in curries, stir fries, or straight out of the bag.

Superpowers: Cashews are packed with essential vitamins and minerals. They have high levels of iron, which helps all cells get enough oxygen, and zinc, which boosts immune function. Cashews' levels of magnesium may boost memory and help protect against cognitive problems, while their levels of copper and magnesium may help protect bone strength.

Power boost: Although most nuts are healthiest when raw, roasting cashews actually intensifies their antioxidant powers.

5. Peanuts

OK, these guys aren't technically nuts, they're legumes -- but they mingle just fine with their nuttier friends. Try adding some to Asian salads or grinding up some homemade peanut butter in your food processor.

Superpowers: Looking for an energy boost before a workout? Peanuts deliver a lot of protein with a relatively small amount of fat. Peanuts also contain resveratrol, the component in red wine that may help protect against Alzheimer's.

Power boost: Peanuts rapidly lose both flavor and antioxidant power with storage time, so it's best to eat them soon after buying them.