A team lead on this new study is Herman Pontzer, an anthropologist who has done a lot of great work on figuring out human energy expenditure. To me, he is one of the key players in science uncovering that it's diet which is key to losing weight, and that exercise -- for all its excellent virtues -- is a mere and distant helper to weight loss.
Today's news is a headline maker in that we didn't know that TEE had an upper limit, and we certainly didn't know that it was only 2.5x BMR! Pontzer's previous work did uncover that bursts of regular activity didn't stack calorie totals like we imagine when we log them in our calorie trackers for several reasons (we adapt, during and after and upon repeating the activity). With today's news, we're starting to see the extreme metabolic boundaries come into view.
Article:
Human endurance is capped at 2.5 times resting metabolic rate, study finds
For the study, the researchers measured daily calories burned by athletes who ran six marathons a week for five months as part of the 2015 Race Across the USA, which stretched 3,000 miles from California to Washington, D.C. They also looked at other feats of endurance, such as 100-mile trail races and pregnancy.
The investigators found that the mega-marathoners burned 600 fewer calories a day than expected. This suggests that the body can power down its metabolism to keep the body going.
Article:
Is There a Limit to Human Endurance? Science Says Yes
Some say the breaking point is all in your head, but new research suggests it’s also in your gut
Beyond the threshold of 2.5 times a person’s resting metabolic rate, researchers found, the body starts to break down its own tissues to make up for the caloric deficit.
One explanation for this limit may be the digestive tract’s ability to break down food, [...]
In other words, eating more won’t necessarily help someone make Iditarod history. “There’s just a limit to how many calories our guts can effectively absorb per day,”
STUDY
Extreme events reveal an alimentary limit on sustained maximal human energy expenditure
- https://advances.sciencemag.org/content/5/6/eaaw0341 (seems complete, not abridged)
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