Live data from Hacker News

Daily energy expenditure through the human life course

research.brighton.ac.uk

41–50 of 256 posts

Re: Daily energy expenditure through the human life course

#41
post #13

This was completely expected, at the macro level this is easily observed by measuring the outputs of metabolism and bodily function, mainly heat and physical activity. All humans have a baseline bodily temperature, meaning that the inner metabolism also is the same across all humans.

metabolism varies greatly controlling for height, activity level, and weight . sometimes as much as 600 kcal /day

Re: Daily energy expenditure through the human life course

#42
post #31

Anecdotally: I havent changed diet one bit, actually I eat way healthier than when I was younger. And still weigh much more than when younger.

I think thats basically true for most people, hence the belief that metabolism slows with age. Proving that its not metabolism would imply that our weight gain in later life is a combination of other factors. I would bet good money on the increase in sedentary leisure activities, the reliance on motorised vehicles and a lack of energy to be active. I would bet on those long before anything as nebulous as diet or inta…

yep, so many people go from 10k steps a day in college to 5k in an entry level position to 1k in a desk role. for a 200lb 6 ft tall male, thats 3000 kcal burned a day to 2600, to 2300. 700kcal a day being a weight change total of around 1.5 lb a week when you consider days off.

Re: Daily energy expenditure through the human life course

#43

Muscle burns more energy than fat. As people age, their muscle mass declines without sufficient exercise, so we'd naturally expect the average person's metabolism to decline via this even if "metabolism per kg muscle" didn't change.

muscle burns very little calories, and even pro bodybuilders who have lots of muscle quickly put on fat off-season when not dieting. I don't think this explains it.

Re: Daily energy expenditure through the human life course

#44
post #31

Anecdotally: I havent changed diet one bit, actually I eat way healthier than when I was younger. And still weigh much more than when younger.

I think thats basically true for most people, hence the belief that metabolism slows with age. Proving that its not metabolism would imply that our weight gain in later life is a combination of other factors. I would bet good money on the increase in sedentary leisure activities, the reliance on motorised vehicles and a lack of energy to be active. I would bet on those long before anything as nebulous as diet or inta…

Have kids and compare yourself against them. It truly sobering to see how much relentless energy hey have, in body and mind (and when they hit the wall with burning out all energy, they hit hard). All the movement is just burning through all energy. I feel myself very active, but next to my 3 year old son I feel glacial and lazy.

We can reverse that, like we can revere many ways we slowly decline, just need a right mindset. Spend a really active vacation or start a new sport and lack of energy of yesterday will be gone, to certain extent. One can always do some dramatic change in lifestyle to see a dramatic change in body, weight, strength, stamina etc.

I see as people get older their mental model of how they behave and think often mimics somebody much older than their actual age, acting as if they are completely powerless to greater evil forces of muscle atrophy and weight gain. It simply ain't true but going against it is certainly harder than just complain.

Re: Daily energy expenditure through the human life course

#45
post #9

Another sobering result for the fitness industry, that convinces 30 year old men to be on TRT.

Convincing men at basically peak testosterone production to permanently impair their natural ability to produce it. It's awful. Not to mention the side effects of taking exogenous hormones e.g. damage to your liver...

Peak? We're talking about 30 year olds.

For some it's not really convincing. They look at it like doctor perscribed steroids.

Re: Daily energy expenditure through the human life course

#46

This doesn't seem to line up anecdotally; The first outlier I see is female health and PCOS, starting in mid 20s for women. The next outlier I see is insulin resistance and pre and diabetes based metabolism decline. From a hormone perspective, nose, ear, chin (femalr), and head hair seem to be going under significant change.

how many outliers or exceptions do you need before you can throw out the theory

Re: Daily energy expenditure through the human life course

#47

Muscle burns more energy than fat. As people age, their muscle mass declines without sufficient exercise, so we'd naturally expect the average person's metabolism to decline via this even if "metabolism per kg muscle" didn't change.

"Even when you’re sleeping at night, the brain consumes roughly as much energy as it does during the day."

https://www.brainfacts.org/brain-anatomy-and-function/anatom...

Does this change over time also?

Re: Daily energy expenditure through the human life course

#48

Muscle burns more energy than fat. As people age, their muscle mass declines without sufficient exercise, so we'd naturally expect the average person's metabolism to decline via this even if "metabolism per kg muscle" didn't change.

muscle burns very little calories, and even pro bodybuilders who have lots of muscle quickly put on fat off-season when not dieting. I don't think this explains it.

they put on fat because the body fat level they compete at is unsustainable for long periods of time. additionally gaining fat is unavoidable when trying to gain muscle past a certain point.

Re: Daily energy expenditure through the human life course

#49

Anecdotally: I havent changed diet one bit, actually I eat way healthier than when I was younger. And still weigh much more than when younger.

There's a theory that you're gut is optimizing over your life. So you were young, and you could eat garbage by the truck load and not see a pound. You're now eating better and exercising portion control, but your body has learned how to extract everything it can from food.

Re: Daily energy expenditure through the human life course

#50
post #31

Earlier quoted context omitted.

I think thats basically true for most people, hence the belief that metabolism slows with age. Proving that its not metabolism would imply that our weight gain in later life is a combination of other factors. I would bet good money on the increase in sedentary leisure activities, the reliance on motorised vehicles and a lack of energy to be active. I would bet on those long before anything as nebulous as diet or inta…

yep, so many people go from 10k steps a day in college to 5k in an entry level position to 1k in a desk role. for a 200lb 6 ft tall male, thats 3000 kcal burned a day to 2600, to 2300. 700kcal a day being a weight change total of around 1.5 lb a week when you consider days off.

Multiply that by 15-20 years and you’re looking at a solid extra 200lbs you have. Naturally every 40 or so makes you look in the mirror, make some minor changes that last a year or maybe a bit more and it’s back to getting out from under the gelatin we’re packing onto ourselves.

In order to really, truly, get a handle on your weight - you need to increase muscle mass, operate at a slight caloric deficit, eliminate excess calories, and forgive yourself. The easiest way to distract you from excess calories is by doing something that keeps you busy (and hopefully works those muscles). Bikes rides, hikes, climbing gym, treadmills, skating, skiing, walking at a faster than moderate pace, running, weightlifting, tree cutting, brick laying.

People often get demotivated when they call it “working out”. Instead, just call it “working”.

Post reply on HN