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Cutting back on foods with high glycaemic load feels intuitively correct - and we are seeing reversal of what was seen as an irreversible condition (T2DM). That is not to say everyone will benefit but on the basis of 'first-do-no-harm', it is an intervention which has attracted welcome attention.
To get anywhere near 'winning' the battle against a rising tide of long term food-borne diseases such as T2DM, we need our profession and those allied to it, to come together around that on which we agree and be respectful and curious about areas where there may be dissonance.
Dr Unwin and his ilk are doing the profession and their patients a service and should be supported in their endeavours.