Why people lose so much weight so fast after WSL?

It may sound a bit stupid.

But what specifically changes after WSL?

I saw a few posts of people post op and they lost 50-60 lbs in 2-3 months… that’s crazy. That means that they had such a big deficit. Maybe 2000 calories deficit/day.

But why it’s safe if you eat that low cal after op (theoretically you need to eat more to heal your wounds after op) and why it isn’t safe to eat that low calories without operation?

submitted by /u/whatissocute
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source https://www.reddit.com/r/loseit/comments/yjorgi/why_people_lose_so_much_weight_so_fast_after_wsl/