Hi E_Lou.
I also am in my 20's, got diagnosed @ 21 and turning 25 in a few weeks.
I personally have never been a drinker, but I know a lot of other diabetics that do, and some overindulge, and some don't. it's all about moderation though (as you and others have mentioned)
As for weight gain, I only gained about 10 lbs more than what I was before the whole 'losing weight thing' began. It's hard to shed those 10 lbs extra, but it's also worth the fight. In doing so, it keeps me constantly working out and that results in better blood sugars.
Given, lately my glucose levels have been ridiculous, but that's due to lack of exercise.
Anyways, I also just joined here yesterday, but I've been dealing w/ this condition for almost 4 years. If you have any questions, don't hesitate to msg
