Your body burns more calories digesting protein than carbs or fat.
Evidence from Studies
Supporting (3)
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Effects of Varying Protein Amounts and Types on Diet-Induced Thermogenesis: A Systematic Review and Meta-Analysis
This study found that eating more protein makes your body burn more calories just to digest it, compared to eating the same amount of carbs or fat — which is exactly what the claim says.
Postprandial Thermogenesis Is Increased 100% on a High-Protein, Low-Fat Diet versus a High-Carbohydrate, Low-Fat Diet in Healthy, Young Women
This study found that eating a lot of protein makes your body burn more calories after meals than eating a lot of carbs, which is exactly what the claim says — protein takes more energy to process.
Thermic response to isoenergetic protein, carbohydrate or fat meals in lean and obese subjects.
Scientists gave people meals with the same calories but made of either protein, carbs, or fat, and found that the body burned the most extra energy digesting protein — just like the claim says.
Contradicting (1)
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The study found that eating protein burns more calories than eating carbs or fat, which matches the claim — but it also found that this isn’t because of brown fat activity, which the claim didn’t mention, so the reason behind it might be different than thought.