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Study: How Many Calories You Burn Depends On The Time Of Day

According to a new study published in Current Biology, how many calories a person burns during periods of inactivity depends on the time of day. Researchers claim you burn more calories in the afternoon and early evening while at rest than you do in the morning. Learn about this study as part of your Phentermine 37.5mg weight loss journey.

A 10% Difference

New findings say you burn 10% more calories in the late afternoon and early evening compared to the morning during rest periods. These findings support the important role of the circadian clock in metabolism changes.

"The fact that doing the same thing at one time of day burned so many more calories than doing the same thing at a different time of day surprised us," says Kirsi-Marja Zitting of the Division of Sleep and Circadian Disorders at Brigham and Women's Hospital and Harvard Medical School and the paper’s lead author.

Circling The Globe”

Researchers studied seven people in a special laboratory where they had no concept of the time outside. The idea was to chart their metabolism changes without influences from diet, the sleep-wake cycle, and activity.

"Because they were doing the equivalent of circling the globe every week, their body's internal clock could not keep up, and so it oscillated at its own pace," co-author Jeanne Duffy from the Division of Sleep and Circadian Disorders at Brigham and Women's Hospital, says. "This allowed us to measure metabolic rate at all different biological times of day.

"It is not only what we eat, but when we eat -- and rest -- that impacts how much energy we burn or store as fat," Duffy adds. "Regularity of habits such as eating and sleeping is very important to overall health."
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About the Author

Dr. James Kojian M.D. has had extensive training in weight loss, hormone replacement treatments, anti-aging medicine, and has many med spas and weight loss clinics in California.

Dr. Kojian went to Medical School at the University of Illinois and trained at White Memorial Medical Center in Los Angeles. He now teaches patients how to eat to lower their hunger, helps them correct deficiencies in their blood tests to boost their metabolism, and shows patients the best exercises to burn fat and tone muscle.

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