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Daily energy expenditure through the human life course

research.brighton.ac.uk

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Re: Daily energy expenditure through the human life course

#51

Post by paulpauper »

dp-hackernews wrote: post #7

No mention of how a persons lifestyle changes over that period though. Surely there is a correlation to the causation? The head-bone is connected to the neck-bone etc... You cannot study figures in isolation and expect them to yield some meaningful results while ignoring the influence of other figures upon those results. - Kids move around a lot, and they're still growing/developing - Teenagers move more constructive…

If inactivity was the explanation, it logically follows it would be possible to undo obesity by simply having people move more, but the evidence suggests exercise does not help compared to diet.

https://cdn.vox-cdn.com/thumbor/U1RxtW9oglcck-2g2X_SrKzIA44=...

Re: Daily energy expenditure through the human life course

#52

Post by m3kw9 »

logicchains wrote: post #34

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.

A lot of skinny people have high metabolism, how do you explain that?

Re: Daily energy expenditure through the human life course

#53

Post by uncletaco »

Lord-Jobo wrote: post #42
dijit wrote: 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.

I’m a 6’0 man who went up to 220lbs when I started working a desk job that provided sodas on demand. When I left there and went somewhere I needed to walk to eat lunch to I lost 30lbs and now hover around 190lbs.

When I learned how to swim last year that dropped to 175 ish and would’ve probably kept dropping if I spent more than 3 months going to the pool for an hour a day twice a week.

Re: Daily energy expenditure through the human life course

#54

Post by sacrosancty »

paulpauper wrote: post #28

I ain't buying it. There is a replication crisis in the sciences, and it would not surprise me if this is wrong too, or at least that the results do not mean what they are purported to mean. I have read many personal accounts here and elsewhere of men who were able to eat a lot in their late teens, 20s, and early 30s, and then suddenly by their 30s gain a lot of weight despite not changing their lifestyle or diet muc…

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Re: Daily energy expenditure through the human life course

#55

Post by stvltvs »

paulpauper wrote: post #43
logicchains wrote: post #34

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.

There are multiple factors in maintaining bodyweight: diet, activity level, muscle mass, metabolism, etc. We shouldn't expect a single factor to explain everything, but holding eveything else constant, more muscle and the physical activity necessary to maintain it will burn more calories. It's an important part of maintaining health as we age.

Re: Daily energy expenditure through the human life course

#56

Post by Pigalowda »

Auracle wrote: post #20
Aurornis wrote: post #15

Earlier quoted context omitted.

TRT is great for people who have true hypogonadism that can’t be fixed by other means. I had a friend growing up whose testosterone was under 100ng/dL no matter what he tried with his doctor. Finally got TRT and felt normal again. However, after the honeymoon period the experience made him realize that not everything is explained and fixed by testosterone. He still had some mental health issues, he still had to work…

I had low testosterone due to a brain injury, and going on TRT was absolutely life changing. I do wonder if it could be largely beneficial for older men in the same way hormone replacement therapy for post menopausal women is. That said, permanently messing with your hormones as a younger person for no good reason is insane and I would try to talk anyone I knew out of it. Fun fact: I had an endocrinologist at the Uni…

Did you have hypogonadotropic hypogonadism from the brain injury? If you did the endocrinologist is right about the TRT. Without TRT you would have been infertile because you lacked GNRH/FSH/LH from disruption of your hypothalamic pituitary axis due to injury. Your Leydig cells would not be able to produce local testosterone in your testes for your Sartoli cells to utilize in spermatogenesis.

With TRT you would have systemic androgen but not high enough in your testes locally for spermatogenesis. So with or without TRT you would be infertile (if you have hypogonadotropic hypogonadism)

Re: Daily energy expenditure through the human life course

#57

Post by cpncrunch »

m3kw9 wrote: post #52
logicchains wrote: post #34

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.

A lot of skinny people have high metabolism, how do you explain that?

Likely genetic, such as beta adrenergic receptors.

Re: Daily energy expenditure through the human life course

#58

Post by arpinum »

m3kw9 wrote: post #52
logicchains wrote: post #34

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.

A lot of skinny people have high metabolism, how do you explain that?

Fidgeting.

Re: Daily energy expenditure through the human life course

#60

Post by paulpauper »

hotnfresh wrote: post #22
dfjkdksjds789 wrote: post #2

Super useful outcome, especially given I find that people think that after reaching even young ages 24, 25 even begin thinking that metabolism has some extreme drop off right after reaching young adulthood

Anecdata: I ate 3500-4000 calories a day of mostly junk in high school and college. I lifted weights some. I (barely) “had a six-pack”. No sports, only incidental cardio. Around age 21 or so, I decided to try to drop a couple pounds and make it a really cut six-pack. I ate a strict 1400 calorie diet (packaged food to make it easy, no cheating at all) for about three months. I started running a couple times a week. I’…

same here but at a later age

this seems to agree with a lot of people's personal accounts. A switch is flipped in which the body for whatever reasons starts hording energy. maybe it is stress from family life or work related... who knows...The weight comes on so fast... it's nuts how much weight some people gain starting at 25 or so. Guys who were 130-180 lbs lean in college now 240+ lbs all a sudden at 30+.

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