I only time I recall my Lucy ever throwing up was when she would chase wasps and get stung in her mouth - this would always make her very sick, but she never got sick because of food. Gigi never got sick unless I gave her whiskas with gravy. For a very long time now I have given a mixture of cooked fresh meat and fish, some wet and dried cat foods (without preservatives/additives). Plus also some cooked vegetables. I also put water on some of their food. Maybe I have just been very lucky!