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Why does it take longer to digest protein than fats or carbohydrates?

Pierre Dukan
Nutrition & Dietetics
Of all the food categories, the digestion of proteins is the most time consuming. It takes over three hours to break down and assimilate proteins. The reason for this is simple: protein molecules are long chains with well-soldered links, and to break down their resistance requires the combination of good chewing and the simultaneous attack of various gastric, pancreatic, and biliary juices.

This long process of calorie extraction taxes the system; it has been calculated that to obtain 100 calories from a protein food, the system must use 30 calories. We can say that the specific dynamic action of proteins is 30 percent, while it is only 12 percent for fats and just 7 percent for carbohydrates.
The Dukan Diet: 2 Steps to Lose the Weight, 2 Steps to Keep It Off Forever

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The Dukan Diet: 2 Steps to Lose the Weight, 2 Steps to Keep It Off Forever

Devised by Dr. Pierre Dukan, a French medical doctor who has spent his career helping people to lose weight, the Dukan Diet rejects counting calories and promises permanent weight loss while allowing...

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.