Eat fish at least once a week – research has shown that oily fish such as tuna is good for the arteries and the cardiovascular system in general. But make sure you get the best value for money when you go fish shopping.

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Check for the following: the skin of the fish should be shiny, almost metallic, with colour that has not faded; the scales should be brightly coloured and tightly attached to the skin, while the gills should be red and free from slime; the odour should be fresh or mild, not fishy; the eyes should be bright, clear, transparent and full.

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