How many calories do we burn? It depends on the time

Our body tends to burn more energy at rest during the late afternoon and evening. This underlines the importance of the circadian rhythm, our inner time, which has important implications for our metabolism


calories (REE, from English spending for rest) depends on the time of day: during the late afternoon and evening our body will burn almost 10% more than calories compared to late nights and early in the morning. To prove it is a new study published today Contemporary biology, which emphasizes the important role it plays circadian rhythm, our indoor clock, on metabolism,

circadian rhythmit actually synchronizes with day and night cycles, for example through exposure sunlight, This would explain why eating and sleeping irregularly, two factors that could destabilize this cycle could lead to some individuals accepting weight (REE corresponds to most of the energy consumed in our body every day and is a critical factor in weight changes).


The research was carried out in a special research laboratory without windows, internet access, or phones to avoid 7 participants clock were outside. Each participant was provided with a watch, which was regulated by researchers and shifted forward for 4 hours a day. During the experiment, which lasted three weeks, each participant had to sleep and wake up at a certain time – the shift of the hours ahead was in fact equivalent to traveling from the west to the four time bands daily.

Since the study simulated a full circle every week around the world, the participants' inner clocks could not keep up, "he explained. Jeanne Duffy, co-author of the research, added that it allowed the team to measure REE participants at all different biological hours of the day.

Calories at rest

The data obtained appeared as the lowest consumption calories at peace corresponds to the circadian phase of the late night, during which time temperature our body is falling. The highest REE corresponded to the diametrically opposite phase, approximately 12 hours later, in the corresponding until late afternoon and evening hours.

But it's not just the number calories burning at peace, which varies according to the stage of the circadian rhythm in which our body is located, but also what our body uses to produce energyThe team actually measured it respiratory quotient (QR) patients, ie Patient Relationship carbon dioxide exhaled e oxygen prepossess. This factor provides guidance on how much fat and carbohydrate used our body to produce energy, and the researchers noted that it also differed according to the circadian phase: especially QR was lower (which corresponds to our body burning more fat for energy production) in the evening and the morning in the morning (in this case more carbohydrates)

"It's not just what we eat, but when we eat it and when we rest, it affects how much energy we burn or convert fat, "Explained Duffy," as a result, having regular eating and sleep habits is extremely important for our health. " The team is now keen to find out how the appetite and reaction of our body to food it differs during the biological phases of the day and how it affects the duration and regularity sleep,

Links: Current Biology

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