How young is too young for light food?

The boys went to the vet today to get micro chipped (Jordan keeps trying to run out the door, so I'd rather be safe than sorry). While we were there I had the vet weigh them because I was curious. Well Jordan (8 months) is now almost 10#, Levi (9 months) almost 11#. They have both put on 2 lbs in the last 2 months. I think Jordan is already a rather tall & long cat and he is solid muscle which is why he's already 10 Lbs. Levi, on the other hand, has a little bit of a pudgy belly. Right now they get 1/2 a cup in the morning before I leave & a little less than an 1/8 of a cup right before I go to bed. I am feeing them Royal Canin Indoor formula. The vet suggested 2 things, first to stop giving them the second feeding & feed them only once when I got home from work. I do the night time extra because otherwise they are waking me up to get food. Well the problem I have with that is, Jordan becomes destructive when left with out food. So I'm working on a solution to that problem. Then she also said maybe I should switch them to light food. Now if they were adult cats who were continuing to put on weight I would do it with out a question, but they are still growing so I don't really like the idea of that. How do others feel about it?

When I told my vet that I was feeding Zoey (she is a year and a half) lite food, she told me I shouldnt and that I should just give her LESS of the regular food.

I started my boys on a lite food. Peppurr was 20 pounds last November, he now weighs 18 pounds! Zeus is 9 months old and weighs 14 pounds! That's WAY to heavy for his age. They get wet food as a treat every now and then. I feed them raw chicken with sqaush, parsley, a pinch of garlic, banana and lot's of water every couple of months.

How about giving them 1/4 cup in the AM and another 1/4 cup in the PM?

We feed Patches 1/4C wet and 1/3C Dry 2X Per day she hasnt gained a ton .shes kinda weird to lastnight we tried to give her more than usual because of her being operated on today she refused to eat it.

Could it be the food , meaning the type? I dont know Im asking

Sorry to drop in like this.

Sicycat, does that apply to older cats too? My Mum buys our cat (now 4)Iams a fair bit - anyway she loves the Iams so much that she keeps coming in to eat more during the day - of course she started gaining weight so now if Mum buys Iams she'll buy diet Iams. Our vet just told me not to feed her during the day, just fill her bowl with the Iams once in the morning and that's it (at the time Amber was slightly overweight).

Well I decided since I just switched them to the indoor formula to give that a try first to see if they stop gaining. Also,I'm going to feed 3/8 of a cup in the morning & 1/8 at night. (I tried the 1/4, 1/4 thing & they ate it too fast in the morning & then Jordan becomes destrcto boy)