So Mark is in kidney failure. How did that happen?
Turns out that diabetes is the leading cause of kidney failure, and Mark has been diabetic since he was about four years old.
If you remember from biology or anatomy class, our kidneys have the job of filtering wastes from our blood. Wastes are small and sift through microscopic holes in the form of urine, but the larger proteins and blood cells don’t fit through the holes and so stay in the blood. The kidneys squeeze the waste through its filtering system and the waste is excreted in our urine.
High levels of blood sugar from diabetes makes the system work overtime and eventually start to leak. Proteins leak into the urine and more and more waste ends up in the blood causing the kidneys to work even harder. As they work harder, they leak even more and finally cause the kidneys to fail. You might think of a kidney being angry at Mark’s body, so it decides to quit.