LOSING 4+ PER WEEK?

zacksnana

Someone on mfp posts she is doing Whole30 and eating only organic and basically no carb. She said this is the way to go and has lost 37 pounds in 8 weeks on this plan.

Two questions:
I cannot wrap my mind around 37 pounds in 8 weeks and am really conflicted. Is it possible to go from 259 to 222 in 8 weeks while eating 900 to 1200 of organic etc?

Is it sustainable and healthy?

Thank you!