I've been bad at sticking to them, but everything I've read from Atkins and a host of thousands tends to make me believe the following:1) The worst thing you can do is eat stuff that shoots your blood sugar to the roof. Large quantities of high glycemic foods = really bad idea. Say bye bye to that large plate of fries, and not just because they were cooked in oil, because they turn to sugar nearly instantly in your blood.
2) a "calorie is a calorie", but some are worse than others. Eat too much, get fat. Eat too much bad carbo... get Fat AND Diabetic.
3) Its really hard to massively overeat on just proteins and fat, we get satiated really fast on that stuff. Obese people starting Atkins induction will lose weight no matter how much they eat because they are still eating less than needed to maintain their original weight. This needs modified as they start getting closer to goal weights.
4) This may be the most important point of all... the human body is not built to handle large numbers of calories at one time, and especially not large amounts of sugar (carbs). Only so much storage room for carbohydrate especially, otherwise it's stored as fat. Before it gets stored as fat though it turns into blood sugar and wreaks havoc on your hormone system. Keeping meals to 500-600 calories each and eating more often makes a ton of sense, and is way easier if your carbos are low density and filling.
5) the "right food" diet is probably the paleo diet our ancestors would have eaten... basically if you can kill it or pick it up off the ground or tree or whatever and eat it without processing, then it's the best food for humans. The more you have to smash it, cook it, or mill it to make it digestible, the worse it is.
this seems to be a general consensus of everyone except maybe the people who benefit from selling crap food and anti-cholesterol drugs.