With All My Heart — Rosemary Vernon

Meet Jessie, the sixteen-year-old junk food fanatic who has fallen in love with Mike the serious super jock who loves health food. Even though their eating habits aren't the same, it won't get in the way of true love.
But there's something that puzzles Jessie about Mike. His feelings for her run hot and cold. Could it be that Mike is afraid of love? Jessie is determined to find out and take a chance on ruining a perfect romance!