Are you not losing, or have you begun to lose more slowly. I am not sure about Dr Poons diet, mostly because diets imply an ending. But allow me to relat my experience with Weight Watchers.
I lost 11pounds the first week.
I lost 4.8 pounds the second week.
I lost 0.2 pounds the third week.
I made no change the fourth week.
I gained 0.2 pounds the fifth week.
16 pounds in the first four weeks. but I never lost at anything like that rate ever again. Nor did I expect to. A proper and sustainable weight loss would be between 0.5 and 2 pounds a week average over any four week period.
I lost a total of 90 pounds in 18 months, 78 weeks. Dropping those first four week, I lost 74 pounds over 74 week, and average of 1.0 pounds.
I have kept most of that loss off for over three years now.
Don't think you are plateaued yet. Don't give up. Stay with a good plan that balances your nutrients, keeps you satisfied, reduces your calories, moves your body, and that you can stay with over the long term and doesn't deny you, and you will lose weight.
Start by doing what is necessary, then do what is possible and suddenly you will be doing the impossible -- St Francis of Assisi
Rock 'n' Roll Dublin Half Marathon, Dublin, Ireland, 8/5/2013 ie.competitor.com/dublin/