The most rapid weight loss on the Dukan diet is during the first phase
, called the Attack phase. Dr. Dukan, through 30 years of experience as a nutritionist helping people lose weight, knows that dieters are the most determined during the first few days of their diet. He designed the Dukan diet with this in mind and came up with what he calls the Attack phase. Depending on the weight loss goals, the attack phase lasts from 2-7 days. These days are protein only days. Dieters can eat most meats and fish, as well as eggs. Dairy products such as cottage cheese, yogurt, quark and skimmed milk can be eaten as long as they are the non-fat varieties.