What causes IBS and what can we do about it? Are there some foods you shouldn't eat if your gallbladder's been removed? Could a white couple give birth to a black child? In what simple ways can we save water? What's gluten intolerance? Plus, the condition CIDP - chronic inflammatory demyelinating polyneuropathy - what is it and how can it be treated? Chris Smith speaks to Eusebius McKaiser. Like this podcast? Please help us by supporting the Naked Scientists