A report published by the Consumer’s Association of Which? reported that pre-packed fruit and veg in UK supermarkets had low levels of vitamin C.
For example, supermarket fresh mango contained 42 per cent of the vitamin C level indicated in standard nutritional tables and sliced runner beans contained only 11 per cent. Vitamin C decreases in foods after they have been picked, peeled and chopped. Ready prepared produce causes an even greater loss.