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I think you have a misunderstanding of how orlistat works. It doesn't actually 'block' fat it lessens the production of fat metabolising enzymes that are produced in the gut. I don't think taking more of it than is recommended enhances the effect in any significant way.
In order to lose weight on it you are going to have to limit your portions (read calories) in conjuction with the low fat diet. I can very easily overeat on healthy food, particularly nuts and seeds, as I found out when I did a low GI diet. My biggest problem with my weight was not poor food choices, as I eat fairly healthily, but portion control. You need to determine some way of measuring how much you are consuming remembering about a third of your calories from fat will not be absorbed. This may not be as great as you think as, for example, if you have 45g fat per day and one third of that is not absorbed (15g) its only 135 calories (15x9) per day. Without lowering your calories intake below what you expend its going to take a long time to lose weight relying on the orlistat alone.
However a lower calorie diet in conjunction with the orlistat does produce better results than is achieved by diet on its own. Its not a magic bullet that is going to help people lose weight without modifying their diet.
Kitty
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