What if you can only eat plain white rice and warm water for the rest of your life?

You would die if all you ate was white rice. It doesn't have all the nutrients a body needs to sustain life in the long term. 

@Justin - Anorexia is an eating disorder characterized by an abnormally low body weight, an intense fear of gaining weight and a distorted perception of weight.

You don't slowly become anorexic. 

So - assuming that I had a disease that would kill me if I ate anything else other than rice and water...............

I would make my favorite meal - enjoy it completely - and die.

Of course - the obvious answer here is that anyone eating only rice and water is going to die anyway - so might as well die while enjoying something GOOD.  

You can't survive very long on rice and water rice has some vitamins and the ability to make a small amount of protein. But you would soon die of malnutrition berry berry is a common disease for those that have nothing to eat except rice and water.

You literally will starve to death. You might live longer if you supplement your diet of plain white rice with boiled mud. It will give you some vitamins and minerals and help you to live longer but not a lot longer.

Then you would probably become slowly anorexic because a diet of white rice and warm water isn’t healthy because it doesn’t have all of the vitamins and minerals that your body needs. So you would become anorexic and probably die.

I want to eat only rice but that looks weird, we have to eat with gravy or soup