* Sarah Stanner, of the British Nutrition Foundation, says: 'We have been worried for some time by the possible effects of highprotein, low-carbohydrate diets.
'Apart from the fact that they involve excluding a major food group, there has been debate about the risks to kidney health because of the effect of eating so much protein.
'The fact that it can be high in fat and is low in fibre means that it carries a risk of heart disease.'
Amanda Wynne, of the British Dietetic Association, adds: 'Drastic reduction in carbohydrate can result in constipation and digestive problems. Most of the initial weight loss comes from stored carbohydrate and water, not fat, while ketosis can result in nausea and tiredness.'
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