Thin Riddles

I Serve By Being Devoured
Riddle:
My life can be measured in hours. I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe. What am I?
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From Head to Toes
Riddle:
You use me from your head to your toes. The more I work, the thinner I grow. What am I?
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