Something you do that you feel makes you healthier. Could be something like a 30 minute walk a day, drinking plenty of water, mindfulness, keto, etc.

Or alternatively something you tried that didn't work for you or you felt made you less healthy (but please clarify if this is what you mean though).

I am much more interested in another question—a question upon which the 'salvation of humanity' depends to a far greater degree than it does upon any piece of theological curiosity: I refer to nutrition. - Nietzsche