Avastin, Peanut Allergy, Bowel Bacteria and Faecal Transplants - a podcast by BBC Radio 4

Mark Porter visits a very smelly laboratory to find out how your gut bacteria could be influencing your weight - and more besides.

Doctors have written to the authorities asking for permission to use the drug Avastin instead of the more expensive alternative, Lucentis, to treat patients with age related macular degeneration (AMD) - the commonest cause of blindness in older people. Inside Health investigates.And new research into peanut allergy, turning conventional wisdom on its head, that every parent should know.

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