If you include nuts in your daily feedings, you’re most likely leaner than the guy who doesn’t, say researchers from the University of Otago in New Zealand.
After analyzing data on 4,721 participants, they found that those who regularly ate whole nuts (including pistachios, walnuts, pecans, almonds, cashews, hazelnuts, and macadamias) were on average five-and-a-half pounds lighter than the non nut-eaters, and their waists were three centimeters tighter. Scientists believe that somehow the body does not absorb all of the calories in energy-dense nuts. Another theory is that certain substances, such as the anacardic acid found in the unsaturated fats of cashews, for instance, actually helps speed up metabolism at the cellular level. If you do opt for a healthy handful of nuts, just make sure you’re cutting back on other, hopefully less-healthy, sources of fat in your diet.