Eating a diet with lots of walnuts and cashews — making up 20% of your daily calories — may boost your body's antioxidant power more than a standard healthy diet if you have metabolic syndrome.

If you have metabolic syndrome and eat a healthy diet, adding a lot of walnuts or cashews every day for two months doesn’t seem to boost your body’s antioxidant levels any more than the healthy diet alone—even though nuts are packed with antioxidants.

If you have metabolic syndrome and eat a lot of walnuts or cashews every day for two months without losing weight, it probably won't improve your cholesterol, blood pressure, or other key health numbers much.

If you're an obese adult with metabolic syndrome, eating a handful of walnuts or cashews every day for two months won't noticeably improve your cholesterol, blood pressure, or inflammation—if you don't gain or lose weight.

Eating walnuts every day for six weeks doesn’t seem to boost your body’s overall antioxidant levels if you're a healthy older adult who already eats well.

Eating walnuts every day for six weeks doesn’t seem to boost your body’s overall antioxidant levels if you're a healthy older adult who already eats well.