Depends on what you are already feeding. When I suggest cat food or hamburger it is a supplement to something already close to their diet & usually only for 2-3 days. If all your wanting to feed is heart for a week, that would be worse then you only eating heart for 3 months. It wouldn't be very healthy. You'd be better off with cat food but it still wouldn't be very healthy for that long. High protein with fat would be better then low tho.