Basic bio.
You need more carbs than either fat or protein since carbs are one's quick energy. They are what one uses to sprint away from tigers or irritated wives whatever the case may be.
Fat is good since it has 3 times the potential energy yield than either carbs or protein. So if you want to work out for longer than 20 minutes, yeah eat a LITTLE fat... preferably the non saturated type.
Protein is the last reserve when it comes to one's body. Protein makes up one's muscles, hair, teeth... one's whole body. For the body to go to protein for energy is like desperation... images of holocaust victims comes to mind in this case. They were fed next to nothing so the body had to eat itself. Some people get this confused with malnourishment which is what 3rd world countries citizens usually suffer from. Malnourishment is when one gets enough for satiation but not enough for all necessary bodily functions. But I digress...
Atkins diet is good in theory since one surpresses extra carb/sugar intake in place of more protein. This way one's body uses the fat already in the body instead of quick energy carbs (which btw if not used are stored in the body as fat).
Remember when KFC tried to get on the low carb marketing by saying "if you wanna go low carbs high protein eat fried chicken." Yeah, good marketing, bad for your health. The point of atkins is low carb, not high fat. Defeats the purpose if you add to the fat count already in your body.
Anyway, atkins diet is not a forever thing, once you lose the excess weight get off the diet and eat sensibly... and hell, even if you plan to do that most people will fail anyway.
Atkins diet is so strict, want a snickers bar? Too bad. Once you eat that candy you've just screwed the whole deal. Assuming a person is on the atkins diet I will also make the assumption that the person is too lazy to watch what he eats and/or work out so what makes one think that that person is disciplined enough to stick to the diet OR work off the carbs that he sneaks in when he craves them ie the snickers bar.
So anyway, Atkins = meh.
Booyah end rant. Go me for my first off topic rant.