Tim Spector is one of the world's most sighted scientists. When he fast, a different set of bacteria appear in your gut because bacteria replicate every hour or so. Tim says this comes down to two different teams of bacteria that operate inside us. And when there's no food for them, suddenly the group that depend on food die away or go into a little bit of a sleep and others that live off the debris and the rubbish that's left behind come out of the woodwork and multiply.

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