Peanut allergies amongst children has increased in the last couple of decades. Why? Most likely it is because parents, with the best of intentions, are not allowing their kids to eat peanuts at an early age when they can build up tolerance.

For full leukaemia to occur, another biological event must take place and this involves the immune system. “For an immune system to work properly, it needs to be confronted by an infection in the first year of life,” says Greaves. Without that confrontation with an infection, the system is left unprimed and will not work properly.”

Source: ‘For 30 years I’ve been obsessed by why children get leukaemia. Now we have an answer’ - The Guardian