Walnuts are high in omega-3 fatty acids, which are shown to lower blood triglyceride levels and raise HDL or "good" cholesterol levels. Studies have also shown that a daily 1/2 cup of walnuts not only lowers LDL levels in the bloodstream, it also improves the quality of LDL particles.
This increase in quality prevents the particles from building up and sticking to artery walls, thus lowering the risk of heart attack and blood clots. Most of the time, stick to the 1/2 cup serving size—too must of this healthy fat food can actually lead to an increase in LDL numbers.

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