A low-fat diet is not a no-fat diet. There are traces of natural oils in vegetables, beans, and fruits, and these fats are important for health. Some people add additional sources of healthful omega-3 (“good”) fats, such as walnuts, flaxseeds or flax oil, or soy products. And some researchers have found health benefits to having a small serving of nuts each day, despite the fact that nuts are very fatty. The idea is that nuts are heart-healthy and may even prevent arrhythmias—disorders of the heartbeat.
PCRM’s advice is to be cautious with these foods. They can easily impart enough fat to bring your weight loss to a halt. Rather than using nuts and seeds as snack foods (where it is so easy to go overboard), use them as condiments or in sauces, limiting them to about an ounce or so (about one modest handful) each day.