They work.
They work becase by the time you've invested the money in them you feel you "can't afford to fail", and that you're "letting the show down" if you mess up.
So what you are buying is psychology.
Better spending the cash on a membership of a weight loss club and getting not head games, but peer support.
Good luck, from one who is trying hard to overcome severe, chronic, cake retention syndrome.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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