Walnuts
Why you should eat them:
Walnuts prevent the risk of heart disease, are full in omega-3 fatty acids, improve blood flow, and help delay development of breast cancer.
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The details: One in four American women die of heart disease every year. This heart-shaped nut is full of antioxidants and omega-3 fatty acids. One recent study found that eating two ounces a day could substantially improve your blood flow to and from the heart in a matter of 8 weeks. Another study found that the same amount of walnuts can help delay the development of breast cancer and slow tumor growth in mice.