Generally high in vitamin E, a noted antioxidant, they are also good glucose and insulin regulators. Almonds and walnuts contain appreciable quantities of oleic fatty acid like that in olive oil, well known for reducing total blood cholesterol without affecting the HDL (good) fraction. Brazil nuts are high in selenium, another potent antioxidant associated with low rates of heart disease and cancer. Peanuts contain phytoestrogens, folate and other B vitamins, magnesium and fiber. Pistachios are high in fiber, and good amounts of iron and magnesium.
Caution: Nuts are often implicated in allergic reactions.