The more there is the less you see. What is it?

Poor people have me, rich people need me, and if you eat me, you'll die. What am I?

I'M A DOT IN PLACE All the info you need to solve this riddle is contained in the line above. Just remember to use all of the letters, and don't use the apostrophe.

Not a trick, not pretend, nor some imagined deal, I'm what your senses prove and what your heart can feel. I stop the question 'Is this true or surreal?' Name me in one short word

Of common coin, I am the largest, though double my value is more than double my size.