Watch: What is intermittent fasting and how does it work?
Dr Sarah Schenker is a registered dietician and is here to discuss intermittent fasting.
Gallery: Common misconceptions about weight gain-and loss-demystified (Espresso)
This is a popular way of controlling weight, with a number of regimes from alternate fast days to the 16:8 method and the famous 5:2 diet.
Dr Sarah suggests high-protein, high fibre and liquid food on your fast days to keep you feeling fuller for longer.
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