What is the author's primary purpose in writing this essay?

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Read this passage and answer the questions that follow: Obsession Plus Addiction     It is hard to imagine how the eating disorders anorexia and bulimia could be any worse than they already are, but somehow people have found a way. Known unofficially as drunkorexia, this condition is a blend of self-imposed starvation or binging and purging mixed with alcohol abuse. Anorexics use alcohol either to soothe their conscience for eating something they feel they should not, or as their only sustenance. Bulimics binge on alcohol for emotional reasons and then purge by vomiting all of it back up.  ... Show more

What is the author's primary purpose in writing this essay?