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Like most GPs, I have seen many people who 'feel tired all the time'. As we know, they can be a mixture of things!

However, I have noted over the last three-four years that I end up doing blood tests on about half the patients who complain of this. I have noted that about 25-30 per cent of the ones I test have low serum sodium.

On further questioning, they all avoid salt in cooking and don't put any on their food, 'because it's bad for you'. Most of them find the tiredness goes away when I tell them to put salt on their food!

Dr Malcolm Kendrick ('Salt isn't bad for you', Clinical, August 20) is correct. In my experience, low salt diets do more harm than good.

Dr MR Kiln

South-East London

·I have just read the fascinating article by Dr Malcolm Kendrick regarding sunshine and health (Clinical, July 30). It is interesting in that it corroborates what I have been reading recently in naturopthic writings from the 1930s and earlier.

The moreI learn about medicine the more I learn to question received opinion.

Dr Jayne Donegan

GP and Homoeopath

North-West London

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