Losing weight too fast should I be concerned?

Anonymous
I started weight watchers about 5 weeks ago. I was losing like 1.5lbs a week until this week I lost 4. It told me I am losing weight too fast and need to slow down. I have no idea why this would be too fast if it equals to 12lbs in 5 weeks. Also since I am a fairly big person I thought it was normal to lose wieght more rapidly in the beginning?
Losing weight too fast should I be concerned?
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