It is hard not to provide food unless you do not need her to cook or you do not eat at home.
You can imagine the taste of the food if she just cooks for you and family and she does not eat. Even she eats, she may not cook very well.
Besides, do you think she can have sufficient nutrients with that amount given the high living standard. She has to subsidize food with her pay or she will still eat yours silently. When she cooks her own at home, you pay more on energy and you still provide salt, sugar, soy sauce..., unless she just eats ready to eat food.