And the Super Nut is: the WALNUT
WALNUT FOUND HIGHEST IN ANTIOXIDANTS
A study has determined that walnuts have almost twice as much antioxidant power as any other tree or ground nuts, and contain higher-quality antioxidants and more beneficial unsaturated fatty acids. Also, walnut antioxidants were found to have two to 15 times the potency of the renowned antioxidant vitamin E.
Previous research suggests that nuts, which are naturally dairy and gluten-free, offer a fairly unusual combination of nutrients, including high-quality protein, vitamins and minerals, unsaturated fatty acids and dietary fiber. Nuts have been linked in studies to a decreased risk of heart disease, certain cancers, gallstones, diabetes type 2 and other heart problems. Also, despite high calorie content, walnut consumption is linked to lower obesity risk. Scientists have not, however, compared the amount and quality of antioxidants among the different nuts.
The current study focused on nine nut types: walnuts, almonds, peanuts, pistachios, hazelnuts, Brazil nuts, cashews, macadamias and pecans. And walnuts offer another antioxidant benefit: nuts are generally roasted, which can destroy some of the antioxidants, but walnuts are eaten raw. This study was presented March 27, 2011 in Anaheim at the national meeting of the American Chemical Society and has not yet been published.
Pecans = Antioxidant Powerhouse
Pecans are an antioxidant powerhouse. 
Of all tree nuts, pecans have the highest antioxidant content.
They also fall within the top 15 foods overall that hold the greatest antioxidant content.
According to a study in a recent issue of Current Topics in Nutraceutical Research, eating just a handful of pecans a day may delay the progression of age-related motor neuron degeneration and such diseases as amyotropic lateral sclerosis (ALS), also known as Lou Gehrig’s Disease.
Pecans provide over 19 vitamins and minerals including vitamin A, folic acid, calcium, magnesium, phosphorus, zinc and several B vitamins. They are naturally cholesterol-free and, unless salted, sodium-free.