I dunno. Protect your organs perhaps? An extra store of energy when you need to fight disease? Sounds reasonable to me. Thin people would have nothing to fall back on when needed. (No pun etc)
The nurse at the surgery told me, when I had a well-woman check-up - about 30 yeas ago. One remembers these things. 
Daughter not allowed to know new baby’s name until she visits him
How do you leave a review on Sainsbury’s online shopping web site?




So many surprisingly revelations about the agricultural and food industry over the last 40 years, but one medical matter that shocked me was watching the 40 year old presenter having an MRI to check how much internal body fat he had. He was shocked to find out he had far too much for his age, especially as he wasn't particularly overweight. I didn't know we could store so much fat inside our bodies with relatively little on the outside (IYKWIM). It left me wondering how much use our BMI reading is, as this is based on weight and height. 