Our expert says:
I hope you and your colleague lose lots of weight. There are some foods that contain so little energy that they can be regarded as 'fat burning' or having a 'negative calorie' content, because the body uses more energy to digest these foods than they contain, e.g. lettuce, gherkins, tomatoes, grapefruit, watercress, berries, celery, cucumber - but it is impossible to survive on these foods alone. Thus you can certainly eat the so-called 'free foods', but make sure that they form part of a balanced low-fat slimming diet and that you also combine daily exercise with your diet. Also have some fat-free milk or yoghurt with your diet if you intend using it for longer periods because you are not ingesting enough calcium to meet your daily needs.
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