When you encourage others, you'll find that it encourages YOU! Get involved in the SP Community -- read others' SparkPages, Blogs and Messages, and post your replies to encourage them (and, as a bonus, earn more SparkPoints!).
When you click on "View SparkPoints" (at the bottom left of the "My SparkPoints" box), you'll see a list of activities that will help you to earn points. More importantly, these activities will help you to learn more about good health & nutrition while engaging you in the SP Community!