It is the other way round: food cannot make you spiritual, but if you are spiritual your food habits will change. Eating anything will not make much difference. You can be a vegetarian and cruel to the extreme, and violent; you can be a non-vegetarian and kind and loving. Food will not make much difference. In India there are communities who have lived totally with vegetarian food; many Brahmins have lived totally with vegetarian food. They are non-violent but they are not spiritual.
