From what have read Atkins is not sustainable. I eat low carb.
breakfast is three eggs over medium, three pieces of bacon and one slice whole grain bread.
Lunch is a meat portion and usually a can of vegetables
after noon snack is a protein bar and fresh vegetables
dinner is a meat portion, salad or fresh veggies, fruit portion.
Yes I allow myself to cheat and sometimes eat a donut or pizza or something high carb, but generally I stick to the same routine.
Now the kicker is I don't drink any soda, not even diet, but I do drink black (no sugar) coffee and water is key (over a gallon a day for me as I am 360 pounds, and even that isn't enough).