‘I like to be big’

If there is a 'face of child obesity', it is six-year-old, 15-stone Dzhambulat Khatokhov. Sheer size has made this boy from a poor Russian family a hero in his home town and an object of fascination in the west. Nick Paton Walsh tracks him down.

Hunt for origin of HIV pandemic ends at chimpanzee colony in Cameroon

· Animals found with virus strikingly similar to HIV · Butchered chimps' blood may have infected hunters

Just one cigarette in childhood can lead to later addiction, says study

· 'Sleeper effect' seen as source of danger · Change of tack proposed for health campaigners

WHO alarmed at bird flu cases in Indonesia

· Six members of family die from disease in Sumatra· Outbreak caused by close contact between people

Yellow clouds on the horizon

Hayfever sufferers in the east of England have been watching anxiously as a huge dust cloud heads their way, writes Mark Oliver.

Spain becomes the destination of choice for fertility tourists from Britain

· UK disclosure rule leads to huge fall in donors · Clinics advertise for eggs among eastern Europeans

Lighter, if not wiser, fat man stumbles home

· Yearlong, 3,000-mile walk across US comes to an end · Quest to lose weight acquired cult following

OurChemist

Our Chemist – Health