What are the differences between "Chocolat" and "The Edible Women"?
Aside from the major differences in characters and plot - I think what you need to examine most here is the difference in the feelings and emotions related to food in each novel.
The protagonist in Chocolat uses food (chocolate and sweets) as her power to connecting to people. In fact, it is through people's relationship with certain sweets that she is able to read into their innermost secrets, desires, and pain. The more people frequent her chocolaterie, the better she comes to know them.
In The Edible Woman, however, it seems that the deeper the protagonist goes into relationships with people, the more distant becomes her relationship to food.
The two books are based off the same principle that there is a relationship between food and power, but each book takes that in a different direction.