Live data from Hacker News

When somebody loses weight, where does the fat go?

bmj.com

231–240 of 241 posts

Re: When somebody loses weight, where does the fat go?

#231
post #30

It's pretty obvious when you do long fasts. Every time I fast for more than I week, I lose several kilos doing nothing, not going to the bathroom even once except to pee.

What is your intake during the fast? Bone broth? Water? Electrolytes?

Water only. No broth, no tea, just plain water.

Re: When somebody loses weight, where does the fat go?

#232
post #16

Earlier quoted context omitted.

I don't know about easier, but it's certainly more efficient.

How easy it is probably depends on your circumstances. There are infographics and whatnot out there detailing the caloric density of different kinds of food, that make it clear that, depending on the diet you already eat, you can reduce your calorie intake by vast amounts just by switching up what kinds of food you eat. But it's potentially a more expensive way to eat, and probably a more time-consuming one if you do…

Personal experience: I've lost 4lb per months for the last 6 months with no cooking. I'm lazy so I just use microwavable food: 3mn to prepare, I know the number of calories so I can easily stay under my target.

Even with not microwaved but easily made, pre-made soups or veggies are easy to heat and more filing.

Even eating only snacks I can stay under 1.5k per day by just not eating anything on the side.

The trick for most people starting is to not drink your calories: switch to 0% calorie sodas and replace sugar in coffee and tea with aspartame. No fruit juice and check calories as "0% added sugar" usually mean there are a lot of calories.

Re: When somebody loses weight, where does the fat go?

#233
post #13

Earlier quoted context omitted.

It's easier to eat less calories than exercise.

Have you tried it? I did, it's easier only for some time. After you lose about 6-7% of your body weight it's very hard to eat less, your whole behaviour changes.

Yup.

Dropped 25kg (45ish lb) 3 years ago. Gained 12kg back the next 2 years which I removed during the last 6 months. Still more weight to shed but I know what works for me and what kind of effort it requires: going hungry by eating less.

Like lot of fat-logic people I used to think that exercising was required and even the only thing needed to get fit. "I'll just start exercising and be back to an healthy weight" is just a fantasy. There is no miracle way of doing it.

Re: When somebody loses weight, where does the fat go?

#234
post #136

Earlier quoted context omitted.

asthmatic - how did you get it diagnosed after 40 years? just wondering, pure coincidence ?

I had brochitis as a child, which by adolescence and several years of treatment with inhaled steroids seemingly just settled into an adulthood of "I wheeze and my lungs just don't work well". Never saw anyone about it, just figured it was my lot. In 2012 I had a really bad lung infection that resulted in an asthma-like attack and ambulance taking me to hospital in the middle of the night. Months of tests resulted in…

That is a lot of information to dig through. The reason it got me asking was because I thought with asthma couldn't run a marathon.

Even in my earlier year of youth when I was fit I could never run a marathon. Or even 10km. But i was never diagnosed as one with Asthma. I had always felt the air was lacking "oxygen", I am now guessing may be again my big pipes is good, but small pipes are bad.

Re: When somebody loses weight, where does the fat go?

#235
post #149

Earlier quoted context omitted.

I can't help but groan at some of the "obvious" health and weight loss platitudes that get smugly thrown around. " Calories in, calories out! " " You can't outrun a bad diet! " " Weight is lost in the kitchen! " Sure, things ultimately boil down to intake-vs-expenditure. However, it IS more complicated than that in practice . As software developers, we complain when management makes decisions based on inadequate or p…

Your point absolutely has merit. I know some, but not many, badly overweight people who exercise regularly. I know some, but not many, skinny people who never lift a finger. I was mostly trying to address the direct cause-and-effect conclusion the parent comment was making with breathing hard == losing weight

> I know some, but not many, badly overweight people who exercise regularly.

There's a lot of reverse causality in that relationship. Being badly overweight makes exercise more unpleasant and prone to cause injury.

Re: When somebody loses weight, where does the fat go?

#237
post #63
post #54

Earlier quoted context omitted.

Also take daylight savings into account, you could get an extra hour one day a year. Thats a lot more breaths.

Supercharge your weight loss by running west.

Supercharge the whole planet's weight loss by spinning counterclockwise... Robbing the planet of it's angular momentum and extending night and day.

Re: When somebody loses weight, where does the fat go?

#238
post #8

Why is CO2 the correct answer, the answer should be energy/heat + CO2 + H2O? The "burning" of fat in oxygen to CO2 and H2O is exothermic.

From the abstract: "Most people believed that fat is converted to energy or heat, which violates the law of conservation of mass."

Converting mass to energy does not violate conservation of mass. But if anybody on the planet managed to convert a pound of mass into energy, we'd hear about it pretty quickly - it's roughly as much energy as a Castle Bravo thermonuclear weapon released. But chemical reactions of course do not involve any significant change of mass, too low energy levels.

Re: When somebody loses weight, where does the fat go?

#239

Earlier quoted context omitted.

Trees (and other plants) are almost entirely air and water. Very little soil gets incorporated, and almost all of that is trace minerals dissolved in the water.

Curious. I've heard this about trees. What about tomatoes? Cucumbers? etc? Or is this comment only referring to the "substance" of a plant and not its fruit(or similar)?

It applies to fruit and similar. All the sugar and other carbohydrates are air+water primarily. There's a bit of nitrogen from the soil, and everything else is extremely small trace elements. Carbon, Hydrogen, Oxygen, Nitrogen (CHON) are the four most common elements in all Earth life. Plants get the hydrogen and oxygen from water, and carbon (and more oxygen) from CO2 in the air. Cellulose is CHO only. Same for glucose, fructose, etc. Nitrogen is mostly found in the proteins, with a bit in DNA, RNA, and ATP. Humans are about 3% nitrogen by mass, plants are a bit less (lower protein concentration).

Re: When somebody loses weight, where does the fat go?

#240
post #126
post #48

Earlier quoted context omitted.

I'd suspect the more exercise you do the more that number moves up, you'd be breathing harder. I'd hesitate to try and put a 'hard limit' on anything like this.

It's pretty difficult to double that number. Can you really double your metabolism without ill effect? Or without massively changing your lifestyle? The normal expectation is maybe 10-25% change. Any more than than would require things likes 8 hours of exercise per day.

Do you have any sources for those numbers or did it just feel right to type them?
Post reply on HN