Is it actually scientifically impossible to keep weight off permanently?

Is it actually scientifically impossible to keep weight off permanently?

I was reading articles that said it was...
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www.nytimes.com/.../tara-parker-pope-fat-trap.html

Read this.
It says that stayed on track with diet and exercise and still started to gain the weight back.
Is it actually scientifically impossible to keep weight off permanently?
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