I, too, have been using the Atkins diet and found a significant stabilization of my triglycerides and cholesterol levels, with an increase in ‘good’ cholesterol and decrease in ‘bad’ cholesterol. My blood pressure is stable, and my lipid profiles show normal/good ranges all the way through (which I couldn’t say about my pre-Atkins lipid profile).
I would estimate that my diet right now is roughly 50% protein, 30-40% fat, and 10-20% carbohydrate. For myself and hopefully most of the people who try Atkins, the ‘permission’ to eat a lot of high-fat foods is a bit of a novelty that quickly wears off. I find that I do feel more satisfied for longer periods of time after eating an Atkins-approved meal, and I don’t doubt that I’m probably consuming less calories now than I was before. The point is, though, that the reason I’m consuming less calories is because I’m satisfied with the meals and because the vast majority of truly fattening snacks (donuts, pizza, potato chips, regular ice cream, etc.,) are either very restricted or disallowed entirely.
Here’s a twist, though; prior to using the Atkins diet, I was on a traditional ‘low-fat’ diet. And you know what? I also lost weight on that diet, although I was FAR more likely to want to cheat on that diet, and felt hungry far sooner after meals. That, ultimately, was the downfall of the low-fat approach for me.
In regards to nutrition: yes, I think that getting vitamins and minerals from whole food sources is ideal, but Atkins does advocate using vitamin supplements on the diet, which I do use. I imagine it’s not much harder than a vegetarian making sure they get enough protein; either you find sources in foods or you use supplements (whey protein drinks, for example).
About serving sizes; I’m sorry, but the ‘serving size’ amounts listed on packages…? I know of NO ONE that consistently follows those guidelines. I think there is a bit of deception going on with food labeling at times, where ‘serving size’ is determined more by making the caloric and nutritional values look better than the amount of the food that the average person is likely to eat in one sitting. Go to just about ANY restaraunt and the meals they sell you will have MANY times the amount that is considered a ‘single serving’. In many restaurants you can’t even order a steak that is less than 9 ounces.