<p>Sometimes, MIT students take time off to deal with mental issues such as depression. They have to reapply for admission (not the same admissions office as first-time applicants like you, but nonetheless). If they show that they have sufficiently overcome their problems and can continue as a successful student, they are readmitted. I know several cases like this.</p>
<p>This sounds like a good way for you to use the optional essay. You can explain what you went through and how you’ve handled it.</p>