As most of you know, we have 3 cats, 2 are 10 months, 1 is 3 years. Well my problem is this... The two 10 month old kittens are overweight. One weighs 10 lbs and the other 15+. Can I switch them to a "diet" food now or do I have to wait another 2 months? They get 1/4 cup each of dry in the mornings and 1/4 cup in the evenings. They rarely get treats, maybe 1/3 can each of wet every 2 weeks, which Boo eats most of.(they generally turn their nose up at it anyway, and Boo eats it all... She can eat anything, and stubbornly refuses to gain weight!)