Hi:
This seems to be and interesting carb/low carb thread, and Atkins is mentioned quite a bit. I am interested in Atkins, as I participated in a 5 year clinical study comparing Atkins with a low fat diet (DASH). I was a 'lab rat', as they took my blood, weighed and measured me, gave me full body scans and measured my body fat for 2 1/2 years. I also kept food diaries of everything I ate, daily, for 2 1/2 years.
I have books worth of information on the results, but in short, Atkins won. Atkins participants had better blood work, as much or more weight loss, and kept weight off better than low fat. It was totally healthy.
But before I make my point (which is Who Cares?), I will say Atkins was a very low cal diet. When I checked my food diaries, when I could eat all of the fat, protein, eggs and cheese I wanted at any time, and when I was losing 35 pounds in 3 months, I found my average daily calorie intake was about 1200 calories. Despite being able to eat 'as much as I wanted', because of the nature of the food I could eat, I just could not eat that much. (I also ate more salads on Atkins than at any other time in my life, before or since.)
So, to get to my point, I could not stay on Atkins because it did not allow me to eat foods I grew up with and loved - white bread and potatoes. (Atkins in a nutshell is don't eat processed flour, sugar, potatoes, rice or pasta. In my opinion, all diets are variations of low fat or Atkins. South Beach, Paleo, Dekum [?] etc., are just variations.)
5:2 allows me to eat the foods I love, and still lose and maintain my weight loss.