Literally. Nuts are a great source of vitamin E, which studies suggest could be linked to less decline in cognitive abilities. Additionally, nuts are packed with other great nutritional value, boasting vitamins, minerals, protein and heart-healthy fats like omega-3 fatty acids.
However, they are also high in fat and calories, so if you like nuts and can eat them, do so in moderation. Lower calorie options include almonds, cashews and pistachios.
Two of your best options: Walnuts, which are frequently considered a good for your heart snack, and raw, unsalted almonds, which have more calcium than any other nut and are rich in fiber.
The proper serving size of walnuts would be about 14 walnut halves, and the proper serving size of almonds would be about 24 almonds. Pre-portioned, 100- to 200-calorie snack bags of almonds can also be a good option if you have trouble with portion control.