Answer:
What does man love more than life, fear more than death or mortal strife. What the poor have, the rich require, and what contented men desire. What the miser spends, and the spendthrift saves. And all men carry to their graves.
I make you weak at the worst of all times. I keep you safe, I keep you fine. I make your hands sweat. And your heart grow cold. I visit the weak, but seldom the bold.
It's in your hand though you can not feel it. Only you and time can reveal it.
What contains zero calories, but if you consume it, you will probably gain weight?
I am the outstretched fingers that seize and hold the wind. Wisdom flows from me in other hands. Upon me are sweet dreams dreamt, my merest touch brings laughter.
You use it between your head and your toes, the more it works the thinner it grows.