The Atkins Diet has been around for a long time; Dr. Atkins published his first book promoting a low carbohydrate, high protein diet in 1972. Since then, thousands of people have used his formula to achieve weight loss. Kim Kardashian is one of the biggest celebrity names that swears by the Atkins approach, crediting it with her post-baby weight loss (over 60 pounds with her second baby).
There are two main approaches to Atkins: Atkins 20, which is more restrictive and produces faster weight loss, and Atkins 40, which allows more carbohydrate consumption and greater food variety from the beginning. The 20 and 40 refer to the total net carbohydrates (NC) allowed per day. Atkins 20 is recommended for people that have more than 40 pounds to lose, are diabetic or pre-diabetic, and/or have a waist measurement of over 35 inches for women, 40 for men. Atkins 40 is for people with less than 40 pounds to lose, those that want more food variety from the beginning, and/or are pregnant or breastfeeding.