Trivia

[Magicman]

An average human body has 60,000 miles of blood vessels; they'd stretch around the earth twice if laid end to end. Every day, your heart pumps about 1,800 gallons of blood through your blood vessels. Over the course of a lifetime, this vast system carries about a million barrels of blood throughout the body. From the National Institute on Aging

Maybe you can add other health related trivia. 

[doc henderson]

I must have missed this the first time.  and every extra pound equals an additional 2 miles of blood vessels.  No wonder the pump has to work so hard.  Obesity, high blood pressure, coronary disease all leads to heart failure.  

[rusticretreater]

So what happens to those vessels when you lose weight?

[doc henderson]

not a junket of trivia I know for sure.  If it is massive weight loss, they sometimes need a surgery to remove excess skin.  vessel can enlarge or shrink.  If you have a gradual blockage of a major vessel, smaller one can enlarge to take of the slack if given enough time (collateralization).  If you exercise, vessels get larger, and then blood pressure is lower at rest.  You have seen the skinny folk with huge arm veins and arteries.