There are diets that immediately disappeared, and others that attract the attention of doctors. The 2-2-2 method, popularized by Dr. Ian K. Smith in his book The Met Flex Dietbelongs to this second category. Designed as a six -week program, this protocol plays on intermittent fasting, the alternation between carbohydrates and lipids and days of caloric restriction, all accompanied by targeted physical activity. Displayed objective: teaching the body to switch from one energy fuel to the other to promote the combustion of fats.
How does the 2-2-2 week method work per week work
The principle is based on a progression structured in three phases, thoughts to get the metabolism to change its pace without jolts.
- The first week starts gently with an intermittent fast 14:10, or 14 hours of digestive rest between two meals;
- The second week adopts model 5: 2, with two very low days in calories, limited to 500 kcal;
- From the third to the sixth week, place in fasting 16: 8, associated with a strict alternation: one day carbohydrates, one day lipid;
- The fifth week briefly returns to 5: 2 to stimulate the organization again;
- The sixth week concluded with an alternation between conventional days and calorie restriction days.
This strategy, according to Dr. Smith, leads the body to mobilize its fats more efficiently. “”Our metabolism needs to be trained to use different energy sources“He explains in his work.
The role of sport in this slimming program
Food is just a component of the protocol. Dr. Smith insists on the importance of the exercise to maintain muscle mass. Its plan combines three types of activities to be distributed each week: cardio such as walking or bicycle, bodybuilding to maintain force, and HIIT sessions (high intensity fractional training) to accelerate metabolism. According to him, this association nutrition-activity makes weight loss more durable and better balanced than in traditional restrictive regimes.
Expert opinion: efficient or too restrictive?
The method attracts as many followers as skeptics. Testimonies evoke a loss of 3 to 5 kilos in six weeks, without immediate recovery. But specialists call for caution. Erin Palinski-Wade, American dietician interviewed by Women’s Healthbelieves that “This method has the potential to operate, but there have been no large -scale clinical studies to determine its effect on weight loss or overall health“.
She also warns that “This protocol may suit some motivated people, but it remains restrictive. And above all, we must not forget that any rapid weight loss can be followed by a rebound effect“. For her, the results are far from guaranteed:”The evidence remains anecdotal. Some do well, others find this rhythm too hard to hold“.