Answer:
What flies forever, Rests never?
During the 1800's these turned women into hourglasses and is becoming more popular again these days
I'm a god. I'm a planet. I measure heat.
My life can be measured in hours, I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
The sun bakes them, the hand breaks them, the foot treads on them, and the mouth tastes them.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?