I am very skeptical the effect would be meaningful relative to diet/exercise.

We have never been more seditary, and sugar has never been more a part of our diet.

When my mother moved in and we started going on daily walks, she lost a pound a week for one year. When she injured her foot and stopped, with no diet change throughout the entire time, she gained it all back in a couple months.

I would be surprised if people gained weight with no diet change and introduced mostly standing or walking throughout the day into their life.