Composite of a fruit and a seed, where the hard-shelled fruit does not open to release the seed or any hard-walled edible kernels. Hazelnuts, hickories, chestnuts and acorns have a stony fruit wall. Pistachios and Brazil nuts are not biological nuts but are considered nuts in culinary terms. Peanuts are legumes, along with beans and peas.
Nuts are natural prebiotics. Almond skins, for example, might increase populations of bifidobacteria, while pistachio consumption may promote a beneficial gut environment decreasing the number of lactic acid bacteria.

colorless unsaturated aldehyde. The odor is perceived as orris (iris, tenaciously flowery, heavy and woody, used in spices and for home-made toothpastes.), fat and cucumber and is associated with aged beer and buckwheat, old books, and old people smell. It's production is increased with aging, and is generated by the oxidative degradation of omega-7 generated by the oxidative degradation of omega-7 unsaturated fatty acids, such as palmitoleic acidand vaccenic acid, found on the skin surface.