Where does the fat go?

[bullet77]

Apparently we breath out 90% of the fat we lose, the other 10% is urine/water. I've just seen this in an article in the PE Herald page 9. Sorry no link yet.

So, is huffing and puffing up hills the new thing for weight loss?

If this is true we probably breath other peoples fat back in when riding in a group    

[Plentipotential]

Must be. The skinny guys are always in front, not breathing in any fat.

[FrancoisC]

I cr@p mine out.

[Nancy Drew]

I've often wondered about this. Where does the physical mass go to? 

 

At least I understand why I'm struggling with weight now, it's everyone else's fat that I'm breathing in! 

[Iwan Kemp]

I've often wondered about this. Where does the physical mass go to? 

 

Isn't it just burned?

[Nancy Drew]

Isn't it just burned?

 

I don't know..... think about these people that start out at 400kgs and then lose 200kg. 

 

The person has literally halved in size, where has the physical half of that person gone to? If it has burned then the byproduct had to go somewhere? 

 

Maybe a medical person can explain

[dre]

Isn't it just burned?

 

Jip, burned for energy. Just like wood is burned, and fire comes out. Ok, not 'just like' that, but sort of the same... for us non-scientist folk to understand the basics of it.

[Sidewinder.]

Wtf...so what's in sweat then?

[Iwan Kemp]

Jip, burned for energy. Just like wood is burned, and fire comes out. Ok, not 'just like' that, but sort of the same... for us non-scientist folk to understand the basics of it.

 

That's how I have it as well.

[Snytjie]

Apparently we breath out 90% of the fat we lose, the other 10% is urine/water. I've just seen this in an article in the PE Herald page 9. 

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.

[dre]

http://health.howstuffworks.com/wellness/diet-fitness/weight-loss/lost-weight1.htm

[urbanroyal]

Wtf...so what's in sweat then?

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

[GaryvdM]

The answer is complicated, but yes, some of the mass you lose is from exhaling CO2 formed by the oxidation of either carbohydrate or fatty acid.

 

Oxidation of a molecule of Carbohydrate 6 O₂ + C₆H₁₂O₆=>6 CO₂ + 6 H₂O + 38 ATP RER

Oxidation of a molecule of Fatty Acid 23 O₂ + C₁₆H₃₂O₂=>16 CO₂ + 16 H₂O + 129 ATP RER

 

http://physics.stackexchange.com/a/2606

 

On the other hand, plants gain most of the mass from the CO₂ that they absorb during the process of photosynthesis.

 

 

P.S. increasing your breathing rate alone won't increase you weight loss, as that does not increase the rate at which you are oxidizing fatty acids.

[Nancy Drew]

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.

 

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?

[Nancy Drew]

The answer is complicated, but yes, some of the mass you lose is from exhaling CO2 formed by the oxidation of either carbohydrate or fatty acid.

 

Oxidation of a molecule of Carbohydrate 6 O2 + C6H12O6=>6 CO2 + 6 H2O + 38 ATP RER

Oxidation of a molecule of Fatty Acid 23 O2 + C16H32O2=>16 CO2 + 16 H2O + 129 ATP RER

 

http://physics.stackexchange.com/a/2606

 

On the other hand, plants gain most of the mass from the CO2 that they absorb during the process of photosynthesis.

 

 

P.S. increasing your breathing rate alone won't increase you weight loss, as that does not increase the rate at which you are oxidizing fatty acids.

 

You lost me at 6 O2

 

chemistry was never a strong point

[Pulse]

The answer is complicated, but yes, some of the mass you lose is from exhaling CO2 formed by the oxidation of either carbohydrate or fatty acid.

 

Oxidation of a molecule of Carbohydrate 6 O2 + C6H12O6=>6 CO2 + 6 H2O + 38 ATP RER

Oxidation of a molecule of Fatty Acid 23 O2 + C16H32O2=>16 CO2 + 16 H2O + 129 ATP RER

 

http://physics.stackexchange.com/a/2606

 

On the other hand, plants gain most of the mass from the CO2 that they absorb during the process of photosynthesis.

 

 

P.S. increasing your breathing rate alone won't increase you weight loss, as that does not increase the rate at which you are oxidizing fatty acids.

What he said