Why your body burns more calories after eating carbs — if you have brown fat
Brown fat-associated postprandial thermogenesis in humans: Different effects of isocaloric meals rich in carbohydrate, fat, and protein
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Brown fat only boosts calorie burn after carbs—not protein or fat, despite protein having the highest overall thermogenesis.
Most people assume brown fat helps burn all types of food, especially protein, since it’s linked to metabolism. But this study shows BAT is carb-specific.
Practical Takeaways
If you’re trying to lose weight and suspect you have active brown fat (e.g., you get cold easily, live in a cool climate), prioritize complex carbs at meals to maximize calorie burn.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Brown fat only boosts calorie burn after carbs—not protein or fat, despite protein having the highest overall thermogenesis.
Most people assume brown fat helps burn all types of food, especially protein, since it’s linked to metabolism. But this study shows BAT is carb-specific.
Practical Takeaways
If you’re trying to lose weight and suspect you have active brown fat (e.g., you get cold easily, live in a cool climate), prioritize complex carbs at meals to maximize calorie burn.
Publication
Journal
Frontiers in Nutrition
Year
2022
Authors
Sayuri Aita, Mami Matsushita, T. Yoneshiro, Takuya Hatano, T. Kameya, Iwao Ohkubo, M. Saito
Related Content
Claims (10)
Diet-induced thermogenesis is significantly higher for dietary protein compared to carbohydrates and fats due to the energetic cost of protein absorption, metabolism, and amino acid synthesis.
Diet-induced thermogenesis is significantly higher for dietary protein compared to carbohydrates and fats due to the greater metabolic cost of protein absorption, transport, and amino acid metabolism.
Your body burns the most calories after eating protein, fewer after carbs, and the least after fat — which is why high-protein diets are often used for weight loss.
People with more active brown fat burn about 2% more of their carb meal’s energy as heat than people with less active brown fat—this could explain why some people stay leaner even when eating the same food.
Eating a fatty meal doesn’t make your body burn much extra energy, and your brown fat doesn’t seem to play a role in that process.