Is loosing 90lb's in four and a half months possible?
Is it a good idea perhaps is the more important question!
The lady in this video decided she was going to change her life style and appearance as she was unhappy with them both. She achieved her journey without spending lots of money or hiring personal trainers, simply because her "mind set was positive"
Weather the method she decided to use was the right one or good for her body is another question, but the video shows the transformation to her body and she explains the difficulties she encountered a long the way.
Whilst I congratulate her on her achievement and her absolute strength of character, I would strongly advise seeking medical assistance before starting such a radical routine. The safest way to lose weight is to steadily lose a manageable amount (approx 2lb a week) over a sustainable time period, eating healthy nutritious meals which allow your body to repair and sustain it's self throughout the journey.
Weight loss journey's are individual adventures and what is right for one person doesn't automatically make it right for another. Research all types of diets, exercise programs, clubs and gymnasiums, take little bits from each one, listen and talk to people and then when you are ready make your decision.
Whatever you do, don't rush into weight loss unprepared, you could waste a lot of time and effort, but worst of all you could send yourself backwards! Be smart, take control, prepare and act only when you feel you are mentally strong enough to see it through to the end.