If you are prone to kidney stones, nuts are not a good snack. They contain a category of mineral called oxalates, which are found in the most common type of kidney stone. If you’ve had stones in the past, skip the nuts all together.
For healthy people, it’s important to be aware of your intake of oxalate-containing foods, such as spinach, beets, potato chips, French fries, and bran flakes.
Some of these items, including nuts, can be very healthy additions to your diet. But as with all things, balance is key. Choose a variety of greens rather than just spinach, and eat nuts only in moderation.