Never Enough by Denise Jaden
From the author of Losing Faith, a novel about two sisters and the eating disorder that threatens to destroy their family.
Loann’s always wanted to be popular and pretty like her sister, Claire. So when Claire’s ex-boyfriend starts flirting with her, Loann is willing to do whatever it takes to feel special… even if that means betraying her sister.
But as Loann slips inside Claire’s world, she discovers that everything is not as it seems. Claire’s quest for perfection is all-consuming, and comes at a dangerous price. As Claire increasingly withdraws from friends and family, Loann struggles to understand her and make amends. Can she heal their relationship —and her sister—before it’s too late?