Yes, body fat is primarily expelled through breathing in the form of carbon dioxide. When you lose fat, your body breaks down triglycerides stored in fat cells into glycerol and free fatty acids through metabolic processes. These components are then metabolized to generate energy, producing byproducts like water and carbon dioxide. Here’s how it works: 1. **Fat Breakdown**: - Triglycerides (the form in which fat is stored) are broken down into glycerol and free fatty acids during fat metabolism. 2. **Energy Usage**: - These components are further processed in the body, primarily through the Krebs cycle and oxidative phosphorylation, to release energy for bodily functions. 3. **Byproducts**: - The primary byproducts of this process are **carbon dioxide (CO₂)** and **water (H₂O)**. 4. **Excretion**: - **Carbon dioxide** is expelled from the body through the lungs when you exhale. - **Water** is eliminated through sweat, urine, or other bodily fluids. #### Interesting Fact: A 2014 study published in the BMJ found that when 10 kg of fat is oxidized, 8.4 kg is exhaled as carbon dioxide, and the remaining 1.6 kg is excreted as water. This highlights the critical role of breathing in fat loss. So, while physical activity and a calorie deficit are essential for burning fat, your lungs are the primary route for fat excretion.
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