The interesting question here perhaps isn’t so much whether knowing if you are a particular color or 4-letter Myers-Briggs combination helps you or whether there is a solid foundation to the categorization at all. What’s interesting here is rather: what happens when you think of everyone as a pigeonholed category. Intuitively it seems it should be mostly negative especially if the categories don’t even offer any beha…
(This is completely tangential to the main point, but...)
Every diet "works" because the underlying mechanism driving weight loss is eating less calories than your body uses throughout the day. And almost every diet makes people consume less calories than they normally do, at least at first. That's why every diet "works" at least in the short term.