Asked by: Alan Healy, France
Partly this is because, for a given bodyweight, women tend to have less muscle tissue to generate heat.
But the hormone oestrogen also has a big impact because it has the side effect of thickening the blood slightly. This reduces blood flow to the tiny capillaries supplying the extremities.
A 1998 study at the University of Utah found that this can mean women have hands, feet and ears that are 3°C colder than a man’s.