I took up running again too.
I hit the weights pretty consistently each week, but it doesn't do much for the cardiovascular system and the calorie burn isn't there. So yeah after all the stuff I went through last year, I packed on 20lbs.
Once I started running again and lit the cardio furnace, everything else health-wise clicked. Diet cleaned up because I stopped craving crap food, and the added physical activity each day has my body begging for the bed by 9pm. I started counting calories and nutrition too...mainly to make sure I'm consuming the right amount of calories as I overdid the diet at one point and got nasty flu like fatigue from starvation mode kicking in. Myfitness-pal app + samsung gear fit pro has helped me stay on top of things. Cool thing is that I'm finding I can still 'budget' things like 2 slices of papa john's large pizza and hit my goals for the day if I'm good the earlier part of the day

I'm down 8 lbs so far!
Cardio is totally where it's at. Create a calorie deficit and the pounds will melt away. It's actually pretty amazing! Most of the year I try to spend 6-8 hours a week cycling.




