Appetite (noun)

1. A natural desire to satisfy a bodily need, especially for food.
2. A strong desire for something.

Origin:

Middle english: from old french apetit, from latin appetitus, from appetere "seek after".

Examples:

1. He had a healthy appetite for food.
2. She had no appetite for breakfast.
3. I have lost my appetite for meat.
4. He had a great appetite for learning.
5. She had a voracious appetite for books.