What would cause my lower legs, feet and ankles to swell?

I'm four months post-op and have been a somewhat slow loser, but down 50 pounds since surgery and 75 pounds overall (lost 25 before). I exercise, drink lots of water and get in a fair amount of protein through protein drinks and diet. My lower legs don't get any smaller and my ankles and feet are very swollen by the early afternoon (if not earlier). I have a sedentary job, but try to get up and walk as often as possible and keep feet elevated when possible. This is very frustrating and makes me feel like I haven't lost any weight at all. Any ideas?

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