Janet Jackson Writes About Her Weight Struggles

Meanwhile, Janet – who turned 42 last week – has also announced plans for a tour to coincide with her latest album `Discipline`.

The singer is planning to document her constant battle with self-esteem issues, and discuss her fluctuating waistline.

The publication, which is set to be released in November by Karen Hunter Publishing, will include lifestyle and diet tips from Janet's nutritionist David Allen.

Meanwhile, Janet – who turned 42 last week – has also announced plans for a tour to coincide with her latest album 'Discipline'.

The run of shows, her first in seven years, will start in September and includes dates in the US and Canada.

Janet said: "I was supposed to go on tour with the last album.  We were actually in full-blown tour rehearsals at that point - learning numbers, getting everything together, set designs. I had to kind of shut everything down and go into the studio.

"It will definitely be a big production but it will definitely also be something that I've never done before, that people have never seen from me before."