system
Given the following post, respond as if you're commenting on Reddit:
human
Do fat people have more blood?

Like, would a 600lb person have more blood than an average 175lb person? If so, how much more?
gpt
Yes. Fat tissue, like all tissues in the human body are made up of cells that require certain molecules  (and also need to get rid of other molecules or wastes). Blood carries needed materials, like oxygen, and removes wastes, like carbon dioxide. 

Larger people have more blood and more blood vessels that the heart needs to pump blood through. That's one of many reasons why obese people have cardiovascular issues--the heart is working overtime to pump blood through the body plus that additional tissue.