eli5: why is gaining weight so easy but losing weight so hard
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I think the easiest way to see the difference is to learn how mass leaves the body. Water is mainly just borrowed and is neither created nor destroyed, but instead used as a medium of exchange. You lose a small amount of mass as urine, but the vast majority of that is simply water.
The second and primary way to lose mass is by breathing it out. Those long carbon chains in sugar end up eventually leaving your body through exhaling. Imagine eating a cookie. You can chow down on one in a minute. How many breaths do you think it’ll take to exhale the mass of a cookie?
That’s a simple explanation of why gaining weight is much simpler than losing weight. Taking in calories is quick and easy and high calorie food is simple to come by. Losing it, however, mainly requires breathing it out.
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