When we hear about eating disorders, such as binge eating, anorexia, or bulimia, I usually don't know about it.
closed as unclear what you're asking by RegDwigнt♦ Nov 25 '13 at 9:57
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The commas are fine, but the sentence itself needs a little editing. Try
When we hear about eating disorders, such as binge eating, anorexia, or bulimia, we often do not understand much about them.