Instructions
Check your weight rating by going to the game menu. Navigate to the "Logbook," then "Personality," and then "Attractiveness." A weight rating of "0" means your character is not fat at all. The fastest way to lower your rating to "0" is to eat the right food.
Go the produce trader in Fairfax Garden, just outside of Bowerstone Market.
Purchase and eat all of the celery that the vendor has. Each piece of celery reduces your character's weight rating by 5%.
Go to the Inn in Bowerstone Market and make your character sleep for seven days. This will allow time to pass. The vendors will not restock their celery until seven days have passed in the game.
Go back to the vendor, and purchase and eat all of the celery again.
Check your weight rating on the game menu. If you still need to lose more weight, go back to the Inn and sleep seven more days to be able to purchase celery again.
Continue to purchase and eat celery and sleep at the Inn until your character is skinny.