Whats so bad about reheating rice?

I keep hearing all sorts of warnings about reheating rice.

I m 19. My family has been keeping leftover rice, pasta, whatever and reheating it whenever there were leftovers.

We ve been doing this for over a decade... and nothing has happened.

I ve had check ups by doctors for many things and they say I m healthy.

I m active and exercise regularly. I have never been ill from the food we ate.

So what s the problem?