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How does most fat leave the body?

Research shows that 84% of fat loss is exhaled as carbon dioxide. The remaining 16% of fat is excreted as water. During the conversion of energy, carbon dioxide, and water are byproducts of waste. They are excreted via urine, perspiration, and exhalation.

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[updated September 2019]

If you’ve recently joined a weight loss program to help you lose weight, you may be wondering how fat leaves the body once you start losing weight. Weight loss is achieved through a combination of a healthy exercise and a healthy diet plan that focuses on lean protein, healthy fats, and carbohydrates from fruits and vegetables. This combination aids the body in burning stored fat for fuel and energy and preventing the body from storing excess fat that you continue to consume.

But what happens to body fat when you shed pounds – do you sweat it out, pee it out or breathe it out?



How Fat Leaves the Body When You Lose Weight

Watch this video for more information about what happens to the fat that is burned off when you lose weight. To keep it simple, as your body burns up excess fat to create fuel after joining a weight loss program, you then breathe it out as carbon dioxide or expel it through your sweat, urine, tears, and feces. Fat is basically stored energy. And your body uses energy in more ways than you’d think. When you are resting your heart needs the energy to pump your lungs to breathe and your brain to think. This is your basal metabolism. When you’re active your muscles need energy. This means anything from getting up from a chair to running marathon. When you’re eating your digestive system needs the energy to break down and store food. When you diet, you take in fewer calories than your body needs. Due to the deficit, your body turns to fat reserves for energy. During the fat burning process, the body converts fat into usable energy for your muscles and other tissues causing the fat cell to shrink. When you exercise, your muscles first burn through stored glycogen for energy. Typically, after 30-60 minutes of aerobic exercise, your body has burned through the stored glycogen and starts burning mainly fat. Most of us really don’t think about where fat goes when we lose it. In all honesty, we’re just happy that the scale says it’s gone and our clothes fit better. But the fat doesn’t magically disappear when your body starts to burn fat. Research shows that 84% of fat loss is exhaled as carbon dioxide. The remaining 16% of fat is excreted as water. During the conversion of energy, carbon dioxide, and water are byproducts of waste. They are excreted via urine, perspiration, and exhalation. Interestingly, research reveals the lungs as the primary organ used to remove from the body.

Key to Losing Fat

According to physicist Ruben Meerman, who has done extensive research in fat metabolism that was published in the British Medical Journal in 2014, calculations show that the lungs are the primary excretory organ for fat. Losing weight requires unlocking the carbon stored in fat cells thus reinforcing the often-heard refrain of “eat less, move more.”

About the Author – Suzanne Gil, M.D.

Dr. Suzanne Gil obtained advanced training in bariatrics (weight loss medicine) and opened Calla Slimspa Medical Weight Loss Center located in Orlando, FL in 2008 when the need for weight-related assistance became a huge priority. She is a member of the American Society of Bariatric Physicians (ASBP) and dedicates 100% of her professional time to helping as many people as possible achieve their weight loss goals and improve their health. She completed her residency at Orlando Regional Medical Center and is a Board Certified Pediatrician.

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What is the healthiest thing to drink all day?

Water is the best choice for quenching your thirst. Coffee and tea, without added sweeteners, are healthy choices, too. Some beverages should be limited or consumed in moderation, including fruit juice, milk, and those made with low-calorie sweeteners, like diet drinks.

In the beginning, there was water—abundant, refreshing, providing everything the body needs to replenish the fluids it loses. Humans relied on it as the only beverage for millions of years. Milk was introduced with the advent of agriculture and the domestication of animals. Then came beer and wine and coffee and tea, all consumed for taste and pleasure as much as for the fluids they provide. The newcomers—sugary beverages including soda, sports drinks, and energy drinks—offer hydration but with a hefty dose of unnecessary calories that the body may have a hard time regulating. Alternatively, “diet” drinks offer sweetness without the calories, but does that make them a healthy choice?

With so many options, it’s easy to be confused about which beverages are best for our health. Follow the links below for an in-depth look at each, but if you’re short on time, here’s the takeaway:

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The contents of this website are for educational purposes and are not intended to offer personal medical advice. You should seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website. The Nutrition Source does not recommend or endorse any products.

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