Where does the fat go?

[GaryvdM]

Unfortunately not true. You burn the fat for energy. Water is a by product of the process, and is excreted through urine and sweat.

 

Yes H₂0 is a by product, but so is CO₂, at a ratio of 1:1. However the mass of H₂O is 18.02 g/mol and the mass of CO₂ is 44.01 g/mol so the mass ratio of the by products is 1:2.44.

 

Edit: The other factor to consider is that H₂0 formed as a by product of oxidization is reused in the body, while all CO₂ is exaled almost immediately.

[Snytjie]

So basically the byproduct is excreted in the form of some sort of bodily fluid.. makes sense

 

Then for optimal weight loss you want less glucose in your system so that your energy requirements target fat? simplistically one needs to eat less glucose producing foods? i.e. carbs?

You have a limit to how much carbs (which turns into glucose during digestion) your body can store. Usually around 2000kcal worth. If your stores are full your body converts the extra carbs/glucose to fat and stores it.

 

Yes, you can eat less carbs which will result in less accumulated bodyfat. You also have to burn fat in order to effect weight loss. Do exercise at 80% of max HR for long periods of time (45 min+). When you train/cycle/run, do so in controlled fashion and don't get the intensity too high otherwise you burn mostly glucose from your stores and very little fat... 

[blondeonabike]

  You need Oxygen to "burn" (oxidise) the fat. The fat molecule is broken up in steps with energy released each time and carried away by the ATP energy carrier molecule.  When there is a shortage of oxygen the fat molecule is not broken down completely and long story short, the lactic acid levels build up. Fat chemically is made up of Carbon, Oxygen and Hydrogen so basically it ends up as Carbon dioxide in your breath and water in your wee.  For the boffins there is this......

[bullet77]

^^ This, I've read the article again and they traced the atoms pathways out of the body, and out of 10kg of fat lost, 8,4kg left through the lungs as carbon dioxide(CO2 or C02??) and 1,6kg through water loss, sweat/urine/tears/blood   ok I just added the tears and blood.

[Long Wheel Base]

Huh? I cant blame the time of the year for me not understanding any of this as even at my sharpest I would be lost. don't chow junk food + ride plenty = fat gone. 

[gogo@]

Here's a link to an article describing research that shows fat is 'exhaled' - http://www.iflscience.com/health-and-medicine/where-does-your-fat-go-when-you-lose-weight

And here's the long and short of it:

"Losing 10 kilograms of human fat requires the inhalation of 29 kilograms of oxygen, producing 28 kilograms of carbon dioxide and 11 kilograms of water. That’s the metabolic fate of fat."

[usxorf]

So when I'm huffing and puffing up a steep climb I'm literally breathing out my fat ass.

[DJR]

  You need Oxygen to "burn" (oxidise) the fat. The fat molecule is broken up in steps with energy released each time and carried away by the ATP energy carrier molecule.  When there is a shortage of oxygen the fat molecule is not broken down completely and long story short, the lactic acid levels build up. Fat chemically is made up of Carbon, Oxygen and Hydrogen so basically it ends up as Carbon dioxide in your breath and water in your wee.  For the boffins there is this......

You,madam, just caused me a very nasty flashback from my 2nd year at varsity  

[Saag]

So basically conservation of energy: do work that requires energy, this energy is taken from fat (fuel) and the fuel gets depleted.

['Dale]

That's the tears of your fat crying ....????

Hehehe

Exactly

[marcfr]

Unfortunately not true. You burn the fat for energy. Water is a by product of the process, and is excreted through urine and sweat.

 

You burn different % of fat and glucose at different intensities. The factor that decides these %s is oxygen. Your body would like to burn fat all the time as you have about 100 hours of energy in your fat stores (average person). However, fat takes twice the amount of oxygen that glucose does to burn. The higher your intensity the less oxygen you have available and the more glucose burn.

 

Huffing and puffing certainly doesn't burn a lot of fat. You burn primariliy glugose then. Optimum rate to burn fat is around 80% of max HR: there you should burn 50% fat and 50% glucose.

Personally I think it must be true, the carbon atoms in the fat needs to go somewhere it isn't lost or converted to anything else. The only process that that occurs is nuclear fusion where mass is converted to pure energy according to E=MC^2. The only way to get rid of the Carbon is to exhale it as CO^2. We don't crap it out as that is just "excess" food that we ate in the first place.

[DJR]

Personally I think it must be true, the carbon atoms in the fat needs to go somewhere it isn't lost or converted to anything else. The only process that that occurs is nuclear fusion where mass is converted to pure energy according to E=MC^2. The only way to get rid of the Carbon is to exhale it as CO^2. We don't crap it out as that is just "excess" food that we ate in the first place.

......and that carbon is absorbed by plants......which will eventually die and fossilize........into oil and coal.......and billions of years from now someone will build an amazing carbon fibre machine from it.......and call it a bicycle!

[Slakkepas]

Would be more fun if fat screamed while you burn them 

[blondeonabike]

You,madam, just caused me a very nasty flashback from my 2nd year at varsity  

 When we studied the krebs cycle in biology in matric, the kids that did not do science came short big time.   I remember the poor teacher explaining over and over again.  I am sure she had some gin under her desk.

[SwissVan]

When we studied the krebs cycle in biology in matric, the kids that did not do science came short big time. I remember the poor teacher explaining over and over again. I am sure she had some gin under her desk.

Thanks for the London Underground map....

You should consider changing your hub name you are far to smart to be blonde

 

Swiss Executes a quick exit

[flymango]

= IF ("Bicycle > Krebs Cycle"; "Weight Loss"; "Fat Gain")

 

Correct?