I'm 3.5 months in, and I've noticed I'm making a lot fewer typos lately. Back in the day, it often seemed like my brain wasn't in control of my fingers. I was literally averaging 1-2 typos per sentence, not even kidding. In general, my brain feels a lot more focused now.
I'm eating a lot healthier, take fish oil and a multivitamin a day, brisk 1-hour walk too. Also I do a lot of puzzles, but I've always done those cause they're fun and I like them. Sudoku, crosswords, and even jigsaws. I have a mathematics background, my idea of fun.