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New research has found that people are now living longer in developing countries, not just in Europe. With the population growing older but with less young people to look after them, what impact will this have on the world?

Also on the show, how ‘task shifting’ can help countries with a chronic shortage of doctors, often as a result of the HIV AIDs epidemic; we hear from Robin Sheppard and his personal experience of Guillam-Barre Syndrome, a form of rapid-onset paralysis; Deirdre Barrett, author of Waistland, tells us why she thinks we’re getting fatter; and a look at how garlic can help treat arsenic poisoning.