Jackson has managed to pack on 40lbs in recent months and has now employed a personal trainer to help he stay on a strict diet of salads and fruit.
She is also attempting to stick to a rigorous exercise routine mainly consisting of jogging and power walking.
It seems that Jackson extreme fluctuating weight stems from an eating problem she has had since she was young.
A source told the New York Daily News: "She has battled this problem since she was a kid.
"She'll go months eating whatever she can get her hands on, and then she'll go months eating just salads and fruits and drinking Evian water.
"She's had this feast-or-famine eating disorder for years and has gotten up to 200lbs or more at times."
Christ, what is up with the Jackson family?�I suppose compared to her wacky brother she is pretty normal�
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