weight watchers points

I have a colleague at work who is doing Weight Watchers. She is not interested enough in the science to explain why it works, but she told me that fruits and vegetables are 0 points.

I can easily easily eat my maintenance in just fruits and veggies.

The weight watchers system seems to go against the calories in vs calories out principal. Why would it work?
 
It either won't work, or will create a large enough deficit outside out nominal fruit&vegetable intake that the false "0 points" will still leave the person in deficit.

WW is a marketing machine, it's not a successful lifestyle.
 
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