Weight issues

American pop star Janet Jackson’s self-help and diet book

True You: A Journey to Finding and Loving Yourself

hits bookstores in the US and UK on February 15, days after she launches her 35-city world tour in support of her 2009 best-of collection,

Number Ones

. Writer David Ritz, who co-wrote Marvin Gaye's tune

Sexual Healing

, cowrote Jackson's book, in which she details her struggles with self-esteem and weight and the steps she took to overcome them.