Health is affected by movement, physical activity, enjoyment of our work, healthy relationships and mindfulness practices. A good balance of these things help to nourish our whole selves and keeps us sharp, happy, and overall in good health. So many times we think of "health" as our weight but it's so much more than that and it's important to track ourselves to watch for patterns that are either supporting our health or downgrading it. 

If you look at health as your mental, physical, emotional, and spiritual self in balance then it will be easier to know what to do when you're feeling out of sorts. Keep a journal and check in now and then. You'll be surprised just how much you can learn about yourself.