Hazelnuts are very high in energy and loaded with numerous health-benefiting nutrients that are essential for optimum health. 100 g nuts carry 628 calories. They are rich in mono-unsaturated fatty acids like oleic as well as essential fatty acid, linoleic acid that helps lower LDL or bad cholesterol and rise HDL or good cholesterol. Research studies suggest that Mediterranean diet plentiful in monounsaturated fatty acids help to prevent coronary artery disease and strokes by favouring healthy blood lipid profile. The nuts are rich in dietary fibre, vitamins, and minerals and packed with numerous health promoting phyto-chemicals. Altogether, they help protect from diseases and cancers. Hazel nuts are an excellent source of vitamin E; contain about 15 g per 100 g (providing100% of RDA). Vitamin E is a powerful lipid soluble antioxidant required for maintaining the integrity of cell membrane of mucusa and skin by protecting it from harmful oxygen-free radicals. The nuts, like in almonds, are free from gluten, and therefore, safe alternative food sources that can be employed in the preparation of gluten-free food formulas for gluten-sensitive, wheat allergic, and celiac disease patients. Besides being rich in floats, they are packed with many other important B-complex groups of vitamins such as riboflavin, niacin, thiamine, pantothenic acid, and pyridoxine (vitamin B-6). They are rich source of minerals like manganese, potassium, calcium, copper, iron, magnesium, zinc, and selenium. Copper and manganese are essential co-factors for anti-oxidant enzyme, superoxide dismutase. Iron helps prevent microcytic-anaemia. Magnesium and phosphorus are important components of bone metabolism.