The women know there's no end date. They say they will always be food addicts.
Moyer is a pound away from her original goal of 165 pounds but trying to get down to 154. She still uses her MyFitnessPal app and has calorie counts memorized for everything she eats.
Ritchie dropped 111 pounds in the first 10 months and at 149 pounds is now in maintenance mode. She still sticks to the major tenets of the South Beach Diet -- no enriched flour, light on carbs, heavy on protein and veggies. At parties, Ritchie will "taste" most things but fill her plate with healthier options.
She says it's been a healthy change for her whole family. Her kids have learned to eat pancakes with whole-wheat flour and no-sugar syrup as well as brown rice and couscous, and her husband has lost 40 pounds.
"I will always worry about getting heavy again," Ritchie says. "I am not saying I won't take a day off from the gym or eat food that is unhealthy, but I have to keep myself in check forever."