PBA, if your reasoning is correct, then those who are married to people who are ‘unattractive’ according to the standard where they live, their marriages lack feelings for each other in that way, and if they move somewhere where the standards of beauty are different, that might change, because according to your reasoning all humans are insecure and need to look like the next person. You must be a fan of Aldous Huxley. People who are insecure (which the more I see, the more people I find who are insecure- that I agree with you)and therefore cannot decide what is beautiful. Is this what you are saying?
Also, about eating disorders, that may be the root. or circumstances that can cause the possibilty of an eating disorder to surface, but eating disorders are almost encouraged when young women are in shidduchim.