More than 1 in 5 participants in the Medi-Weightloss Clinics survey say business lunches are where they feel the most pressure to overeat.

WSJ: Colleagues Who Can Make You Fat

"People tend to have a rapid response when it comes to weightloss, but Atkins is also known to have one of the greatest rebounds, so people pile the pounds on when they come off it, " says nutritionist and dietician Nicole Berberian.

BBC: Atkins and the never-ending battle over carbs