Results from studies at Andrews University, led by Peter Pribis, associate professor of nutrition and wellness, and published in the British Journal of Nutrition, have shown that walnuts may be a key brain food. Eating walnuts regularly can increase critical thinking, specifically inferential reasoning. (Inferential reasoning can be defined as the ability to infer truth from other known truth and it is also the ability to deduce information based on prior experience and context.) According to Pribis, students who ate half cup of walnuts a day for eight weeks showed an 11.2 percent increase in inferential reasoning skills. That works out to the difference between an A or a B, or a B and a C. (I prefer raw or dry roasted.) And it’s not just the brain! According to research published in the medical journal Biology of Reproduction, eating a couple of handfuls of walnuts a day can improve the health of sperm. Sperm shape, movement and overall vitality improved in men who added walnuts to their diets over the course of 12 weeks.