What if there was something simple you could do every day that would burn calories, be good for your heart, and help you stay young. You'd do it, right?

Well, that's why researchers and doctors are so gung ho about walking, especially in light of new research that credits it for everything from cutting breast-cancer risks to helping you sleep.

Walking is not just a weenie activity for the nonathletic, says Michelle Look, M.D., national medical consultant to the Breast Cancer 3-Day Walk and a physician who specializes in sports medicine in San Diego, California: "It's good for just about anybody, and the health benefits are particularly significant for women." Here, eight reasons to start walking -- or just walk a little more often

1. It's great for the heart

In a recent study conducted at Duke University Medical Center, researchers found that walking briskly for 30 minutes every day lowers your odds of developing metabolic syndrome, a cluster of risk factors linked to higher risks of heart disease, diabetes, and stroke. Roughly 24 million women in the United States have metabolic syndrome. Don't have time for a daily half-hour walk? Try multitasking: A British study found that active commuting (incorporating walking and cycling into your sedentary commute) is associated with an 11 percent reduction in heart-disease risk, especially among women.

2. It cuts breast-cancer risks

Walking, even for a few hours a week, significantly reduces breast-cancer risk, according to a study published in the Journal of the American Medical Association. The thinking is that walking helps reduce levels of body fat, a source of estrogen. The research looked at 74,000 postmenopausal women between the ages of 50 and 79. Those at a normal weight lowered their risk by 30 percent; those who were overweight, by 10 to 20 percent. Younger women may also gain similar benefits.

3. It helps you sleep

A brisk walk in the afternoon will help you get a better night's sleep, according to the National Sleep Foundation. Experts say that walking may boost levels of the feel-good hormone serotonin, which relaxes you. Or, the rise in body temperature brought on by walking may signal the brain to lower your temperature later, which promotes sleep. (Avoid a walk two hours before bed --that's too late to cool down.)

4. It cuts down on aches and pains

Walk the "Chi" (pronounced chee) way and you could have fewer achy days. Nine years ago, Danny Dreyer, an ultra-marathoner then living near San Francisco, California, invented ChiWalking, which incorporates ideas from Tai Chi, yoga, and Pilates. It looks like regular walking but, because you consciously relax, improve the alignment of your body, and involve arm movements, puts less stress on the legs while you walk. That means fewer aches. "ChiWalking can cut down any risk of injury," says Alice Peters Diffely, a ChiWalking instructor in Portland, Oregon. "Your whole body will feel better."

5. It makes you happy

Walking can relieve depression, anxiety, and stress. Just one 30-minute walk may make you feel better when you're down, University of Texas researchers found. Head out for 90 minutes five times a week and you'll get the biggest boost, according to a new study from Temple University. One possible explanation: Walking helps the body produce endorphins, the mood-boosting chemicals linked to "runner's high."

6. It keeps you slimmer

Walking for 30 minutes a day can prevent weight gain in most people who are physically inactive, according to another Duke study. And researchers from Brown University and the University of Pittsburgh showed that women who walked for an hour five days a week and consumed 1,500 calories a day lost and kept off 25 pounds over the course of a year. The reason walking helps control your weight: It's easy! "The harder the exercise is, the less people will do it," says Johnny Benjamin, MD, chairman of the department of orthopedics at Indian River Medical Center in Vero Beach, Florida.

7. It staves off senior moments

Several studies in older people suggest that walking -- even for as little as 45 minutes a week -- helps ward off Alzheimer's disease. Regular strolls are also linked to mental sharpness in seniors. But regardless of your age, walking is likely to help keep your mind active, Benjamin says-particularly if you stroll with friends; walking while talking is a surefire brain booster.

8. It protects your bones

Just 30 minutes of walking three times a week does wonders to prevent and treat thinning bones. This kind of exercise, which uses 95 percent of your muscles, actually pushes your bones to get stronger so they can handle the load. "Walking," Look says, "is not just for cardio."

1. Avocados - Avocados lead my list of anti-aging foods because that are just so delicious. Of course, avocados are loaded with healthy fats to help improve your cholesterol, but the main reason to eat avocados is because they taste so good.
2. Walnuts - Turns out that walnuts are a great (and mercury-free) source of omega-3 essential fatty acids. Eat a handful or two a day for all your omega-3 needs.
3. Green Vegetables - I know, it's pretty boring to talk about the need to eat more vegetables -- but here's the thing, we all really need to do it. In fact, if the country could get 5 or more servings of fruits and vegetables every day, we'd see a huge decrease in heart disease, cancer, high blood pressure and more. So find some way to eat one more veggie or fruit this week, then add another next week until you get to 9 servings. Focus on leafy or deeply colored vegetables for the most benefit.
4. Water - Water is good for you. This seems pretty basic. There is some disagreement in the medical world whether drinking TONS of water is really a good idea, but while they sort that out stay focused on water. Your goal should be to make water your primary drink. This way, you'll be drinking a no calorie, no chemical drink all day long instead of the many, many high-calorie, high chemical alternatives.
5. Berries - Berries are packed full of antioxidants and other chemicals that your body can use to make repairs and prevent some of the damage caused by aging. Best of all, berries taste really, really good. Be sure to eat your berries without any sauces or sugars. Just enjoy them plain for their goodness.
6. Green Tea - Green tea has been a longevity supplement in Asia for thousands of years. It is a great thing to work into your daily life. Green tea contains high concentrations of just the chemicals your body needs. Green tea is also inexpensive, delicious and gives a mild (and gentle) energy boost from its caffeine.
7. Red Wine - Red wine is good for you -- it contains a substance called "resveratrol" that help your body fight off age-related illnesses. At the end of your day have a glass or two to relax and unwind. You'll get the benefits of a delicious drink along with the anti-aging properties of resveratrol.
8. Beans -Beans are a great source of healthy protein and antioxidants. Really, beans are a wonder food. Some researchers (like T. Colin Powell) believe that animal protein may cause many of the illnesses we face as we age. Switching to a (healthy) vegetarian diet certainly will help improve the health of your heart and arteries. Beans are a necessary part of any healthy vegetarian diet. If you don't want to go all the way to vegetarianism, then just start by substituting a few meals a week with bean-based entrees.
9. Melons - When I think of fruit, I don't always think of melons. That's a shame because melons have some of the best nutritional profiles of all the fruits. They are pulpy (so they fill you up) and contain lots of vitamins for your body. Work melons into your daily/weekly diet and you'll be reaping health benefits as you enjoy them.
10. Chocolate - I put chocolate last in this list only because it doesn't need to be higher up to get your attention. Chocolate (dark chocolate, that is) is good for you. It has a balance of fats that don't harm your body and tons of healthy chemicals that your body needs. The only draw-back is that chocolate also has calories. Have a little square every day, but don't overdue it.