After struggling to keep her diet on track and push ahead towards her goal of losing 70 pounds by prom, Christina leaves her family for a cross-country journey to weight loss camp. Will the experience make all the difference?

Dr. Charles Sophy surprises Christina at school with an invitation that he thinks will change her life and jump-start her diet! Will she accept this new challenge?

Join the discussion: Want to offer some words of encouragement for Christina? Post them below!

After hitting a wall in her mission to lose 70 pounds by prom, Christina makes an emotional confession to Dr. Charles Sophy.

As Christina's diet stalls, her habits are called into question ... will she find a way to embrace the diet once again and reach her ultimate goal?

Oprah's fitness guru wants to help Christina find her happiness and keep her diet on track. He's got a special message for the teen and anyone trying to find the inspiration to stay on track and get in shape!

Can Christina push through more obstacles to reach her goal? She's facing more of the emotional roadblocks to the success of her diet and hits the scales for her first weigh-in of the new year!

Want to follow along with her diet? Click here for Dr. Ian's customized eating plan for Christina!

Dr. Charles Sophy helps Christina confront her parents about the situations at home that are upsetting her and possibly getting in the way of her diet. Tune in for more, including her weekly weigh in!

Christina has a teary-eyed chat with Dr. Charles Sophy, who helps the teen face the emotional road blocks that are slowing her down on her quest to Lose 70 Pounds by Prom!

Rachael invites Christina and her dad back to the studio for some tough love with Dr. Ian and asks them to re-commit to the plan! Will they get back on track? Find out and offer your own words of encouragement for the teen!

Plus, check out Dr. Ian's personalized eating plan for Christina!

As Christina falters in her journey to get in shape, Rachael checks in with the teen's trainer, Jennifer Giamo, who has designed an entire workout for Christina in her quest to lose 70 Pounds by Prom. Click here to see that plan and to see Jenn demonstrate all of those exercises!