Italy is a difficult place to manage food, as the popular book and movie, Eat Pray Love will attest, but reclaiming yourself will be important no matter what friends, country or offerings you are around.
It seems as if you know what you need to do to reclaim your body and your control over food.
The grad school you are in may have counselors that can help support you. Many young women struggle with this during this time of life, and the graduate school may have staff who can help directly, or who can point you in the direction of support in the area. The online support group here at Psychcentral can also give you a place to help cope.
The best coping is through prevention, which will require you to anticipate those times when you will need to have food available that doesn’t challenge you. Shop and prepare ahead for those times when you come home and are most vulnerable. Drink good water regularly so thirst isn’t confused with hunger, and when you are invited someplace bring a serving of foods good for you that you can put out with your guests’. Preparing to succeed will give you the best opportunity for success.