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Some 40 to 50 per cent of adults in Western societies are overweight and up to 20 per cent are obese - and these figures are rising all the time. Each year hundreds and thousands of euros are spent on what has become known as the slimming industry. Countless articles and books have been written on the subject of diet and weight loss, all giving conflicting advice - cut out sugar/stop eating starch/stay away from bread/avoid yeast and on and on.