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Small changes in your daily intake can make a huge difference to your weight. To change your body mass index - your BMI, you would only need to eat an extra seven calories a day more than you burn - the equivalent of half a slice of cucumber. Professor Sadaf Farooqi of the University of Cambridge, explains.

Picture: Cucumber salad
Credit: Barnaby Perkins/Â鶹ԼÅÄ