The fun part of the game is that we try to encourage social healing. So, if you have a difficult day or week, and lose a lot of life points, you can ask people to heal you by requesting a plea for fruit from the game wall page.
You can also heal yourself, but it still requires a public plea for fruit, and will take 4 pieces of fruit for every life point healed rather than the 2 that are required to heal someone else.