I’m not an AC, but I’d give points for your topic, depending on HOW you overcame it. I mean if you’re going to say you just went on a diet, then I wouldn’t. But if the journey involved self reflection, challenges along the way (counteracting the Lethargy) etc, I would totally use it as a topic. It also explains your GPA, plus weight loss is a very personal journey. They like personal. So… go for it. Have someone(s) - English Teacher, maybe? read it over and critique, provide feedback. Good luck !
It would help too if your proposed major is fitness/nutrition/ theraphy etc etc