Cashew nuts are actually seeds in the bottom of the cashew apple, which comes from the cashew tree. This tree is native to northeastern Brazil. The cashew is light-tan in color and shaped like a kidney. Cashews are lower in fat than most other nuts, and the majority of the fat is unsaturated, according to the World’s Healthiest Foods website, sponsored by the George Mateljan Foundation. The CalorieKing weight-loss website provides nutritional data on dry roasted cashews without salt added. The values are based on a 1-oz. serving.