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endoself comments on How I Lost 100 Pounds Using TDT - Less Wrong
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It sounds like you just needed something to convince yourself with. TDT isn't special in this regard. With some inventiveness you could also have used quantum mechanics, evolutionary biology, extrapolated volition, or any number of other LW topics :-)
The advantage of TDT is that it is actually supposed to be a method of choosing how to act. The problem with the metaphor is that CDT and UDT would prescribe the same behaviour in this context.
The metaphor still works, but it's just that it should be about the usefulness of decision theory in general rather than about any particular one.
"I used decision theory to decide." is not the point of the post, and that does not seem like it would make a very good post. What is actually illustrated is a calculation that can be done to help one decide and intuitively grasp the reason for the decision.