No, anorexia and other actual eating disorders are mental illnesses. They occur in the developing world as well, just like depression/anxiety/bipolar/etc, but they’re muuuuuch less likely to be diagnosed and treated than in developed countries because either people can’t spare the resources or because people there don’t believe there’s such a thing as mental illness. It can also be harder to spot in areas with food shortages. Who’s going to suspect Dad has an eating disorder instead of just really caring about his kids and giving them his food all the time? Young affluent women absolutely do fake anorexia for attention, but it’s a real mental illness that you can’t just snap out of or stop, and it affects men, poor people of both genders, and older people of both genders. Anorexia, when it’s real, is a serious and horrible fucked up thing. I have absolutely zero sympathy for anyone faking it, as it makes things harder for actual anorexics to be taken seriously and to get proper treatment. Bulimia and OFSED (basically catch all for eating disorders that aren’t bulimia anorexia or compulsive eating) are far more common than true anorexia, but purging is messy and not as “glamorous” so attention seekers don’t usually pretend they have it. Anorexia is heavily romanticized but it has one of the highest fatality rates of any mental disorder.