I've recently received several questions about optional secondary essays and their necessity.
The beauty of an "additional comments" section is that it is intentionally vague. It's your chance to provide details, context, or qualifications that the structure of the application didn't allow you to present. For that reason, I lean toward using that space to both highlight who you are and any exceptional aspect of your candidacy that you'd want a reader to know before making an interview decision.So, one good option for these essays is to pick something completely nonmedical that distinguishes you and is nowhere else to be found on your application. In this case, the essay can actually be fun to write.
Of note, sometimes people use this type of a prompt to explain one major deficiency in their candidacy. I only recommend that if there's a big elephant in the room: In other words, in general I tell applicants – throughout the process – to avoid highlighting weaknesses. The goal is to demonstrate distinctiveness and worthiness, so negatives are usually left out. But sometimes someone has a big problem like a low MCAT score that is an anomaly that's worth addressing head on.
Bottom line: Since an interview isn't guaranteed, don't save your best material for an in-person meeting. Get your foot in the door. And as always, make sure that your essay is substantive and not fluffy.
