4 months ago i was diagnosed with diabetes . It was a difficult period . This chronic disease helped me define what i should do in life : help the others and try to find cure for such diseases . Do u think this is gonna be a successful response to the common app essay N 2 ?
Although it can be, I’m guessing the ADCOMS have seen this essay before. You want to amuse them, or hook them, or get them to smile or think you are a really interesting person they want to get to know better. The essays that portray you as curious will work better if you can weave that in.
Anything can be a good essay – it is all about how it is written. It is not an uncommon theme, but that doesn’t mean it can’t be well done, personal, give admission officers insight into what makes you tick etc. Be sure to keep things positive and focus on the impact it has had on your personal growth, development, maturity, life goals etc.
Write the essay only you could write:
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Are you comfortable writing about your illness? I am X. I have diabites. I certainly wouldn’t want a feature of my body to define or represent who I am.
Just looking at it from a by-walker’s perspective.
Think about something you are proud of or would like to tell about yourself to others. If that helps, don’t think you are writing to a college. say… let me make up a story. 
You are walking in the mountains alone. You wanted to chill out and hear just the wind in the trees, breathe in the fresh air and look at the horizon. You walk the whole day. You’re tired but happy. You come to the shelter and you begin a casual chat with someone eating their meal next to you. A stranger, but they seem nice and the chat flows naturally. You have the whole evening to talk, rushing nowhere. What do you tell about yourself? Who are you? What is the thing you automatically talk about?
Why did you really choose medicine? Because the diabetes, let’s be honest, does sound like a lie. It can’t be just this single fact, because things just don’t work like that. Now, I’m not telling you to tell the whole truth. It’s just the way you framed it - unfortunate. Moreover, admitting someone who has just one reason for their profession poses a risk of them easily losing this one single reason and hence dropping out or doing poorly, so it’s just unconvincing from the standpoint of the university which wants good, so dedicated students.
Or. Start writing there, go with the flow, craft it , craft it, craft it, and remove the seed in the process, leaving just the more interesting pieces. It is possible to work this way too. That’s a brainstorming method.