Husband's weight gain

My husband had been battling sobriety basically our entire relationship and before we werre together. He started doing meth with his dad at 13 so it's been a long time on and off drugs. He's always been really skinny. His last relasped ended him comatose and I thought we were gonna lose him. He went to rehab after and he's been sober for almost 2 years. Since being sober for so long hes put on quite a bit of weight. He's probably about 10-15 pounds overweight and people keep saying stuff to be about it. Should I mention it to him or just let him be because hes healthy and happy .