Off-season weight gain -- iggh

Well, I held it off until now, but here it comes. Gained 3 lbs. in last month. Doing the offseason training plan and still have my in-season appetite. I was doing good until now and should be grateful I kept it off that long.

I guess when you go from 4-5 hour bike rides on Sunday, 75 miles during the week of riding to and from work, 3 days of running one of which is 2 miles straight up, with 3 swims per week to this pretty low volume off-season life, this is what happens.

I have tried to and have succeeded in reducing intake, but not as much as I should obviously, because of the gain. Thing is, I don't think 3 lbs. is a huge amount but I can already feel the difference when I'm running and swimming, although not so much biking. I feel heavier and slower so it's affecting performance. Alas.

I read that on average folks gain 5 lbs. in the off-season so I'm over halfway to goal! :--(

Any others out there struggling with this?
--Kandice