Its all but impossible to have a conversation about obesity without someone crying about Anorexia. They love breaking out their unsourced, vague and misused stats especially about how it has the highest rate.  140 is the average number in the US that die from AN in a year that is a family tragedy not a public health issue.    Like you said you don't just catch it either its a mental illness, not a fad.  The rates did not skyrocket after Kate Moss started modeling, in fact, the number of underweight girls and adult females both decreased and continue to decrease.  The most popular Pro Ana sites are not something to actually worry about as they are like 90-95 percent obese people with ultimate goal weights that still have them overweight.    I will say talking about Anorexia so much when its not a major issue and more importantly acting like every attractive but thin model and actress has AN when they are a 19 or even 20 BMI (shit in todays world you will be called AN at 22 or 23 bmi) will make some girls that are prone to this mental illness actually try it.