Where do desires come from ?
Desires are created by contact of your senses with objects. For example, you see something to eat and desire to taste it . AT once your intelligence decides how to get it and tells your mind what the body should do. When you get what you want, you're happy. If you can't get it, you're sad. Your desires are fulfilled through your intelligence, mind and senses.
Your are not your body. Your are not your mind. Your are not your intelligence. Your body, mind and intelligence are your tools to help you satisfy your desires.