Click on the Start Here button above. Primal is simply a pathway to health and a list of foods to avoid and foods to eat for health. You can eat the same foods as you did on Atkins, but you just have to skip anything made with soybeans, canola, wheat or other grains, sugar, artificial processed crap of all kinds, etc. If you read the start here list you'll get a better sense of the WHY of it all.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Current squat: 160 x 2