From YOU: The Owner's Manual, by RealAge experts Michael F. Roizen, MD, and Mehmet C. Oz, MD

Generally, what's harmful to your heart also is also harmful to your brain. Make no mistake about it: While fried potato skins are busting your buttons, there's also a portion that gets shuttled up through your arteries to your gray matter.
Saturated fats, for example, clog arteries that lead to your brain, putting you at risk of stroke, while omega-3 fatty acids -- the good fats found in fish -- are helpful for your brain because they help keep your arteries clear. They also alter your neurotransmitters and reduce depression.
These are the best foods to keep your brain and your RealAge young:
Food Why Recommended
Nuts Nuts contain monounsaturated fats to keep your arteries clear, as well as levels of precursors of serotonin to boost mood. 1 ounce of nuts a day is just right. (More is fine, but be careful of calorie overload.) An ounce is about 12 walnuts or 24 almonds. Men: 3.3 years younger.

Women: 4.4 years younger.
especially wild salmon, whitefish, tilapia, catfish, flounder, mahi mahi
Fish contain artery-clearing omega-3 fatty acids. Aim for 13.5 ounces of fish a week, or 3 servings, each about the size of your fist. 2.8 years younger.
Soybeans Soybeans contain heart- and artery-healthy protein, fiber, and fats. 1 cup of soybeans a day. 0.4 years younger.
Tomato juice and spaghetti sauce Tomatoes contain folate, lycopene, and other nutrients to keep arteries young. 8 ounces a day of juice or 2 tablespoons of spaghetti sauce a day. At least 1 year younger.
Olive oil, nut oils, fish oils, flaxseed, avocados All of these foods contain heart-healthy monounsaturated fats. 25% of daily calories should be healthy fats. 3.4 years younger.
Real chocolate (at least 70% cocoa) Real chocolate increases dopamine release and provides flavonoids, which keep arteries young. 1 ounce a day (to replace milk chocolate). 1.2 years younger.