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Fruit of the tree Corylus avellana; cultivated varieties include Barcelona nut, cob nut, and filbert (C. maxima); the British National Fruit Collection has almost 50 varieties. A 50‐g portion (fifty nuts) is a rich source of copper and vitamin E; a source of protein, niacin, vitamins B1 and B2, calcium, zinc, and iron; contains 32 g of fat (most of which is mono-unsaturated); provides 5 g of dietary fibre; supplies 325 kcal (1 300 kJ).

Subjects: Medicine and Health.

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