Since turning 30, I've gained 10-15lbs and now have a flabby middle. I run up to 60 miles a week, eat really healthy, and do planks. I'm still the same jean size (27) as I used to be, so I'm guessing the weight gain is all in my middle area. It might be because I was diagnosed with grade 4 OA arthritis when I was 27 (now I run 2-3min/mi slower than before despite training). Or maybe I have a leaky gut (I've had GI issues for the past 11 years and nothing has worked). I'm 5'7.5" 145lbs, and 32.