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If GPs have to show 'outputs' why don't others, Mr Blair?

It's good news that the importance of zinc in brain function and development is being given publicity (News, April 16).

The best source of zinc is oysters at 145mg per 100g per edible portion. Ginger has 7mg and nuts 4mg per 100g.

Alternatively, mineral supplements are relatively cheap.

Dr Ellen Grant,

Kingston-upon-Thames

Surrey

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