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: