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Does your MC have a healthy lifestyle?

Mostly.

She eats pretty well, and keeps fit.

But she can sometimes hyperfocus on a thing, and then kind of lose track of everything else. She might stay awake for 36 hours straight, and eat nothing but cheese balls and coke while working on a thing that really interests her. That's maybe not the healthiest thing to do.

She also guards herself against forming relationships. Since her mom died, the only real relationship that she's had has been with her dog, so she doesn't like to spend too much time around people. She tries to blame her loneliness on others. They're intimidated by her intelligence, she tells herself, or they don't like her because of her rough upbringing. But, in reality, she keeps people away. So, not a very healthy social or emotional lifestyle.