the longevity benefits associated with nuts (including peanuts) do not appear to extend to peanut butter, perhaps due to the lack of intact cellular structures that deliver a bounty of prebiotic goodness to our friendly gut flora. (See here.) The healthiest nut, however, is probably walnuts. Not only do they have some of the highest antioxidant6777 and omega-36778 levels, but walnuts are the only nuts known to significantly improve artery function,6779 and they beat out others in suppressing cancer cell growth in vitro.
