uptown

It's one thing to encourage your spouse to eat healthy/exercise particularly if you lead by example and join them.

Let me tell you from my own experience though,once a man starts tactlessly critizing specific body parts/facial features it's all over but the crying because it doesn't usually stop.The worst part of this is if you knock yourself out to alter the part that they say they find is unattractive a few months down the road they often say they want the exact opposite ie: he thought your belly pudgy,you lose weight and get a 6 pack then he decides Aria Giovanni is the last word in feminine beauty and suddenly you're too skinny and lacking in curves.

Have it out with him,make it clear you're having trouble with his lack of tact and you're wondering where this is coming from, have you gained weight or are you perhaps being compared to his eye candy flavor of the moment and being found lacking ? Have there been any unusual stressors in his life lately ? Other issues within the relationship ? You need to talk it out.

keep a careful eye on this because over time having a guy be that tactless and figure fault specific will eat your self-confidence and leave your sexuality in shreds.
I'm betting even now when you're in bed with him, your thoughts are zeroed in on your stomach and wondering if he's thinking how unattractive it is.