Dr. David Wilkinson of Liverpool John Moores University in the UK and Professor Graeme Ruxton of the University of Glasgow stated that it is well known that swimmers and cyclists shave their hair to shave off milliseconds, and now scientists believe our ancestors lost their fur for a similar purpose. However, the goal of early humans losing their body hair was not to win gold medals, but to run faster in order to catch prey for food.
They used advanced computer models to show that the hairy bodies of our ancestors hindered their ability to find food, as they couldn’t cool down quickly through sweating, so their hair gradually became less and less. This meant they could run faster, for longer periods, and secure more spoils. This difference between humans (lacking body hair) and other mammals has puzzled zoologists for decades.