MAIL ONLINE: Is this proof your DNA holds the secret to weight loss? The latest theory is that individual genes determine the best way for each of us to diet. We put it to the test

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But many scientists remain sceptical. ‘It’s true we all have gene variants that determine how we metabolise different components of food,’ says Professor Bill Newman, who studies genetics at Manchester University. 

‘But our knowledge of these factors is limited. Even more limited is evidence that applying certain diets in the light of having a specific profile of genetic variants is of any benefit.’