Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

People with low BMI aren't more active, they are just less hungry, 'run hotter'

sciencedaily.com

Post reply on HN
Print view View original

61–70 of 350 posts

Re: People with low BMI aren't more active, they are just less hungry, 'run hotter'

#61

Post by marifjeren »

sudden_dystopia wrote: post #42

The study was underweight bmi vs healthy bmi. Nothing about overweight bmi, which I would assume is the trifecta of overeating, little activity, and slower metabolism. At least that is my personal experience in going from overweight to healthy bmi. Really not surprising that people that eat less have lower bmi and higher metabolism than people that eat more with a slower metabolism but who are more active.

Of course it's no surprise that people who eat less weigh less. The surprise, I think, is that people who are underweight are relatively sedentary.

Maybe this is not that much of a surprise either though? I wonder how much of this has to do with muscle. BMI infamously ignores muscle mass. An interesting followup would be whether people with low body fat % are sedentary. My guess is that they aren't.

Side note: maybe there is a disparate importance of "Calories In" vs "Calories Out" for people who are under/over weight. Maybe underweight people should focus on exercise more, and overweight people should focus on eating less?

Re: People with low BMI aren't more active, they are just less hungry, 'run hotter'

#63

Post by JumpCrisscross »

sleepydog wrote: post #46
the_only_law wrote: post #35

Seems to line up with my experience, am always burning up (until I turn on the AC and freeze) Especially at night though I have to to jack the temperature down or I won't sleep. Also less hungry aligns pretty well. Unfortunately when I get hungry, it's normally "a little hungry) at akward spread out intervals. I probably feel most hungry after midnight but never eat then because well, I have to sleep soon. I've tried…

If you run hotter, wouldn't you feel less hot? Since your normal temperature would be that much higher than the ambient temperature. At least, when I have a fever I feel cold, even though I'm hot.

Speaking anecdotally, my body temperature tends to run above average and I have a body that is shit at throwing off heat. I have dark skin yet still managed to get sun stroke earlier this week in the Mediterranean because my biology prefers me lightheaded than sweating. Morning run in the snow and t-shirt, on the other hand? Easy peasy.

Re: People with low BMI aren't more active, they are just less hungry, 'run hotter'

#64

Post by giantg2 »

causi wrote: post #5
arcanus wrote: post #3

"We expected to find that these people are really active and to have high activity metabolic rates matched by high food intakes," says corresponding author John Speakman, a professor at the Shenzhen Institutes of Advanced Technology in China and the University of Aberdeen in the UK. "It turns out that something rather different is going on. They had lower food intakes and lower activity, as well as surprisingly highe…

Makes me wonder, if thyroid disorders can cause obesity, can thyroid-modifying therapy or exogenous thyroid hormones treat obesity?

I'd imagine that thyroid hormone modifying treatments without thyroid dysfunction could lead to other issues.

Re: People with low BMI aren't more active, they are just less hungry, 'run hotter'

#65

Post by rpmisms »

marifjeren wrote: post #61
sudden_dystopia wrote: post #42

The study was underweight bmi vs healthy bmi. Nothing about overweight bmi, which I would assume is the trifecta of overeating, little activity, and slower metabolism. At least that is my personal experience in going from overweight to healthy bmi. Really not surprising that people that eat less have lower bmi and higher metabolism than people that eat more with a slower metabolism but who are more active.

Of course it's no surprise that people who eat less weigh less. The surprise, I think, is that people who are underweight are relatively sedentary. Maybe this is not that much of a surprise either though? I wonder how much of this has to do with muscle. BMI infamously ignores muscle mass. An interesting followup would be whether people with low body fat % are sedentary. My guess is that they aren't. Side note: maybe…

I am mostly sedentary, and maintain body fat below 10%. It's mainly genetics, and probably 20% diet.

Re: People with low BMI aren't more active, they are just less hungry, 'run hotter'

#66

Post by FollowingTheDao »

ianbutler wrote: post #48

Does this breakdown when you gain weight? Like when I was 20 I weighed 180lbs of solid muscle and was always like a furnace. Then I slipped a disk and now at 28 I'm lucky if I hover around 240 (I've actually been back lifting for the last 2.5 months and feel pretty good) but I definitely feel like I run colder in general now that I'm overweight.

Gaining muscle mass will often lead to a quick onset of obesity once you stop lifting.

Re: People with low BMI aren't more active, they are just less hungry, 'run hotter'

#67

Post by inglor_cz »

I know a girl who weighs about 100 lbs soaking wet. Very slim, elfish type. She also has very hot hands and she says that after eating a big meal, she feels super hot. I asked her if it was measurable and it actually was, she can go to almost 38 degrees Celsius while completely healthy.

Re: People with low BMI aren't more active, they are just less hungry, 'run hotter'

#68

Post by klyrs »

sudden_dystopia wrote: post #42

The study was underweight bmi vs healthy bmi. Nothing about overweight bmi, which I would assume is the trifecta of overeating, little activity, and slower metabolism. At least that is my personal experience in going from overweight to healthy bmi. Really not surprising that people that eat less have lower bmi and higher metabolism than people that eat more with a slower metabolism but who are more active.

I've known very active cyclists that couldn't lose weight despite riding hundred mile rides weekly. In my youth, I could eat anything and do nothing and not suffer the consequences. I definitely fit the "run hot" part but I was the plate-cleaner in my family and didn't really stop eating like that until I was in my late 30s and suddenly started gaining weight.

Re: People with low BMI aren't more active, they are just less hungry, 'run hotter'

#69

Post by FollowingTheDao »

giantg2 wrote: post #56
FollowingTheDao wrote: post #15

My family has Sami heritage, we run cold. My average body temp is 96.8 degrees. We also have trouble with hyperlipidemia, obesity, and early heart disease. So the genetics of all of this will be interesting. I have managed to avoid my family curse by eating pretty much only fish and game meat, like a Sami. And I do not eat much. It was the only diet that would raise my HDL.

I'm surprised how little is said about traditional diets. It's like everyone has to have the same numbers, diet, etc. If they don't, then it's automatically statins or bust.

Yes, but "traditional diets" for who? An Inuit? A Mediterranean farmer? A Sri Lankin Indian?

Our traditional diets changes our genetics, so who you are will determine what is healthy for you.

I agree with the statin. They tried to force them on me. I took a look at my genetics, changes my diet accordingly, and LDL and HDL reversed in three weeks and I have the blood work to prove it.

Re: People with low BMI aren't more active, they are just less hungry, 'run hotter'

#70

Post by corrral »

gjsman-1000 wrote: post #12

To be fully honest - I can relate to this. During my college years, I ate a full-size burger, potato fries, and soda every day for lunch for ~2 years. I never got fat and retained a healthy BMI, never crossing 200lbs despite being a 6'2" male - even though I almost never exercised and spent almost all day sitting working in the Math Lab. I did skip breakfast regularly so maybe that had something to do with it. My fam…

4k+ per day of junk food from ages ~15-20. Then I had to knock it off because I stopped being able to do that while staying trim (got fat fast, and I really was trim before). Which is probably just as well because that wasn't healthy anyway.

Dunno where it was all going. I wasn't really getting much bigger or taller for most of that span.

Post reply on HN