Is the weightwatchers diet a low glycemic index one? If so I live by that, I'm a diet controlled diabetic, and lowGI is a way of life, it is very healthy, and you will eat loads of veggies, just some are very quickly converted by the body to sugar, so for me bad, for you increases your chances of weight gain. The principal of my diet is on your plate, 50% sould be veggies - salad, greens, peppers etc, the more colourful the better for you as a rule of thumb. 25% protien - be that meat or pulses etc, 25% carboydrate - pasta, potatoes, rice bread etc. Complex carbydrates are better so look for whole grains, brown rice, oh and if you're a bread fan, burgen bread is low GI

Low Gi is a great weight loss plan, and if followed well, very good for you, because you're limiting blood sugar spikes, it leaves you feeling pretty full for longer, however, I personally find eatng more smaller meals works best for me, rather than a couple of big ones. FWIW, I'm completely controlled on this diet, with no need for medication now, which I had at the begining... It gets much easier sticking to it as time goes on too, though in the begining I would have mugged small children for their chocolate buttons LOL.