Need help choosing a topic to explain a negative grade trend
I am beginning to write college essays and I am unsure how to explain my grade trend to colleges. I had a 4.0 unweighted GPA freshman year, and a 3.95 for the first half of sophomore year. The second half of sophomore year, I developed a severe case of depression that proved to be resistant to all medication and affected my attendance for that semester and throughout my entire junior year. As a result, my GPA is currently a 3.4. I have overcome my depression and I currently have A's in all of my senior year classes.
I know that depression is a red flag subject, and I do not plan on directly basing my essays on it. However, I need to address why my grades tanked for half of high school. Does anyone have any suggestions on how to go about this?