Obesity hurts blood supply Another problem obesity causes: way less blood available in the aftermath of any disaster. I went to donate to a local blood bank, and the things I heard there were ridiculous. The number of seriously obese people there was astounding, even for my area. And so many of them had to be turned away because of uncontrolled diabetes, high blood pressure, or just flat out being too heavy for the chairs. And they would always scream about how this was discriminatory! They knew they didn't meet the requirements that are readily available online, and yet they still came in anyway. With obesity rates climbing, there's going to more need for blood and less blood available in future disasters, and if there isn't enough, you know who the fat nurses and doctors will prioritize. The amount of fat needs to be controlled now so that when there's a need for blood in the future, there's enough people to give it's going to people that don't need an entire normal sized person's blood volume to survive.