Intermittent fasting has no advantage over conventional weight loss diets

Intermittent fasting helps lose weight and promotes health. However, it is not superior to conventional calorie restriction diets, scientists from the German Cancer Research Center (DKFZ) and Heidelberg University Hospital have found out in a study called HELENA, the largest investigation on intermittent fasting to date.The scientists conclude that there are many paths leading to a healthier weight.



Feasting eight hours and then fasting the following 16 hours? Or is it even better to fast two whole days a week and then enjoy eating without regrets for the rest of the week? Intermittent fasting, also known as 16:8 diet or 5:2 diet, is trendy. Numerous popular self-help books on this topic promise weight loss without yo-yo effect as well as sustained changes in metabolism and resulting health benefits.


The German Nutrition Society (DGE), on the other hand, warns that intermittent fasting is not suitable for long-term weight regulation. In addition, according to DGE, there is not enough scientific evidence on the long-term effects of this dieting method.


In collaboration with a team of DKFZ researchers and scientists from Heidelberg University Hospital, Schübel examined 150 overweight and obese study participants over one year as part of the HELENA study. At the start of the study, they were randomly classified in three groups: One third followed a conventional calorie restriction diet that reduced daily calorie intake by 20 percent. The second group kept to a 5:2 dietary plan that also saved 20 percent of calorie intake over the whole week. The control group followed no specific diet plan but was advised, like all other participants, to eat a well-balanced diet as recommended by DGE.


Following the actual dieting phase, the investigators documented the participants' weight and health status for another 38 weeks. The result may be as surprising as it is sobering for all followers of intermittent fasting. The HELENA researchers found that improvements in health status were the same with both dietary methods.

Health status were the same with both dietary methods

The good news is: a small dieting success is already a big gain for health. Those who reduce their body weight by only five percent, lose about 20 percent of dangerous visceral fat and more than a third of fat in the liver, no matter which dietary method they have used.


The investigators also did not find any difference between the two dieting methods in any other metabolic values that were analyzed or biomarkers and gene activities under investigation.

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