Most people CANNOT stick with low fact/low calorie diets, because A} they don't work and B} they are deprivation diets that make people sick or hungry. That's why there are no long term studies that show net losses on low fat - most show net gains because the participants drop out.
AAAAHHH I can't take it! Have you people been reading my posts? Weight loss is tied to activity, and not diet change! The diet will change when the activity increases!
This makes me think of one of the reasons that I think people turn to alternative diets in the first place; the ultra-low calorie approach is just wrong. I've heard of doctors recommending 1200 calorie-per-day diets to obese people. This is woefully inadequate. It creates the yo-yo syndrome where people gyrate between ultra-diet and ultra-eat. In the long run, their weight chart looks like the stock market zigging and zagging but generally going in an upward trend over time.
You can't hurry weight loss (and you can't hurry love, you'll just have to wait). 1-2 pounds per week is perhaps about as much as one should try to lose.