What is the common thread connecting those who have made it to age 100?   Eat food, not too much says Simin Nikbin Meydani, director of the USDA-Human Nutrition Research Center on Aging at Tufts University.  

Here are some science-backed strategies:   Don't skimp on vegetables.  Eat 5 fruits and veggies a day and slash your risk of heart disease, stroke and cancer.   Eat Yogurt.  It's packed with probiotics to boost your immune system.   Have fish for dinner.   Do it at least 2 or 3 times every week.   Go nuts.   Snacking on pistachios and walnuts help fight heart disease.  and, focus on fiber.

You can get your recommended 25 grams a day by eating fruits, veggies and whole grains.   A high fiber diet can lower your risk of dying say researchers from the National Cancer Institute.