My cat Sadie is 16 pounds and needs to get down to 11 or 12. But my other cat Tallulah is the perfect weight for her size (about six pounds). Up until now my cats have had free access to the food bowl, but that needs to stop. But I am a full time college student that works part time, I can't monitor them all the time. How I can be sure that if I leave a bowl out for both of them twice a day with a healthy amount of food for each that each one gets enough and the other doesn't steal it? Both are picky and don't like to eat when I put food down in front of them, they like to wait and come back to eat it later....help!