PunctiliousKitten
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Did you know? Most of the fat you lose is literally exhaled as carbon dioxide through your lungs, with a smaller portion leaving as water!!
Fun Fact I learned recently
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unclebuff702
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I legitimately just learned this recently too! Unfortunately, the amount of pizza I used to inhale was far greater than the amount of fat I could exhale 
eidos
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No way!
I regret every day that I didn't go to elementary school. (sarcasm)
I regret every day that I didn't go to elementary school. (sarcasm)
Cordar
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Sameunclebuff702 said:
I legitimately just learned this recently too! Unfortunately, the amount of pizza I used to inhale was far greater than the amount of fat I could exhale
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Stace_wow
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Yesterday I heard thisPunctiliousKitten said:
Did you know? Most of the fat you lose is literally exhaled as carbon dioxide through your lungs, with a smaller portion leaving as water!!
Click to expand...
BrightCandle
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Fat is just some hydrogen, carbon and a little bit of oxygen. We are basically chemical factories that take in Oxygen and attach carbon to it to produce CO2 and then we excrete the hydrogen and Oxygen as water. Its a lot more complex than that because we are obviously eating a lot of hydrogen and carbons with little bits of everything else to make it all chemically work but we breath out the bulk of our fat.
ZetsuM
New member
LOL i didn't know... I even asked Chatgpt if it was true. It had to dissapoint me on the first try:
Yes — that statement is essentially true, and it's a common misconception.
When you lose body fat, your body oxidizes fat for energy. The atoms in stored fat are mainly converted into:
For example, if you metabolize 10 kg of body fat, roughly 8.4 kg ends up as CO₂ that you breathe out, while about 1.6 kg becomes water that can leave through urine, sweat, and other routes.
So you do pee out some of the mass, but most of the actual mass of the fat is ultimately exhaled as carbon dioxide.
The important distinction is that breathing more doesn't make you lose more fat. You need to actually metabolize the fat by creating an energy deficit. Your body then uses stored fat, and the resulting carbon is released as CO₂.
So the simplified chain is:
Stored body fat → energy + CO₂ (mostly through lungs) + H₂O (urine/sweat/breath)
Pretty cool, right? Your lungs are actually the largest exit route for the mass of lost body fat.
Yes — that statement is essentially true, and it's a common misconception.
When you lose body fat, your body oxidizes fat for energy. The atoms in stored fat are mainly converted into:
- CO₂ → exhaled through your lungs
- H₂O → leaves through urine, sweat, breath, etc.
For example, if you metabolize 10 kg of body fat, roughly 8.4 kg ends up as CO₂ that you breathe out, while about 1.6 kg becomes water that can leave through urine, sweat, and other routes.
So you do pee out some of the mass, but most of the actual mass of the fat is ultimately exhaled as carbon dioxide.
The important distinction is that breathing more doesn't make you lose more fat. You need to actually metabolize the fat by creating an energy deficit. Your body then uses stored fat, and the resulting carbon is released as CO₂.
So the simplified chain is:
Stored body fat → energy + CO₂ (mostly through lungs) + H₂O (urine/sweat/breath)
Pretty cool, right? Your lungs are actually the largest exit route for the mass of lost body fat.
bamagirl26
New member
interesting because as Im losing, I feel my breathe especially in the night, is different - Bye fat!!! I wont miss ya!ZetsuM said:
LOL i didn't know... I even asked Chatgpt if it was true. It had to dissapoint me on the first try:
Yes — that statement is essentially true, and it's a common misconception.
When you lose body fat, your body oxidizes fat for energy. The atoms in stored fat are mainly converted into:
- CO₂ → exhaled through your lungs
- H₂O → leaves through urine, sweat, breath, etc.
For example, if you metabolize 10 kg of body fat, roughly 8.4 kg ends up as CO₂ that you breathe out, while about 1.6 kg becomes water that can leave through urine, sweat, and other routes.
So you do pee out some of the mass, but most of the actual mass of the fat is ultimately exhaled as carbon dioxide.
The important distinction is that breathing more doesn't make you lose more fat. You need to actually metabolize the fat by creating an energy deficit. Your body then uses stored fat, and the resulting carbon is released as CO₂.
So the simplified chain is:
Stored body fat → energy + CO₂ (mostly through lungs) + H₂O (urine/sweat/breath)
Pretty cool, right? Your lungs are actually the largest exit route for the mass of lost body fat.
Click to expand...
Turbo-Farmer
New member
You can also expel ketones by breathing when your body goes into ketosis. Keto breath is the smell of the ketone acetone.
Shittersfull
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I dint know any of these things. Interesting. So is carbon dioxide the by product of metabolizing fat?
Shadow Dancer
New member
Yes, I learned that when I was a lot younger and almost hyperventilated trying to breathe out more
HereInTX
New member
Yep, I asked Chat GPT what happens if your house has bad ventilation and you're just exhaling fat particles into the air all day. I don't want to walk into someone else's fat cloud either! Turns out, it's not enough at once to make any sort of difference.