你减肥时，脂肪去了哪里?

Weight loss is usually associated with a lower number on the scale and a smaller body size, but have you ever stopped to think about where fat goes when you lose weight? The answer is surprising and complicated.

体重减轻通常与体重秤上的数字和体型更小有关，但你有没有停下来仔细想过，当你减肥时，脂肪去了哪里?答案是令人惊讶和复杂的。

You may already know that fat is stored energy, and that the body uses carbohydrates and protein as energy, too. It takes less effort for the body to convert carbs to energy, which is why it chooses carbohydrates over fat for energy use. Not to mention, it's also easier for the body to store fat (via Livestrong).

你可能已经知道脂肪是储存能量的，身体也利用碳水化合物和蛋白质作为能量。身体将碳水化合物转化为能量更容易，这就是为什么它选择碳水化合物而不是脂肪来进行能量消耗的原因。更不要说，身体也更容易储存脂肪(通过Livestrong)。

For fat loss to occur, you need to consume fewer calories than your body actually needs. This is why reducing your calorie intake and adding exercise to your lifestyle are so important when it comes to losing weight. Your body can begin to burn fat after about 30 minutes or an hour of an aerobic workout and about an hour of moderate exercise, says endocrinologist Bartolome Burguera, M.D., Ph.D. (via Cleveland Clinic). As the body metabolizes fat for energy, it produces heat, which causes the fat cells to get smaller (via Mayo Clinic). Interestingly, fat cells never disappear, they just decrease in size (via Healthline).

为了减少脂肪，你需要消耗比你身体实际需要少的卡路里。这就是为什么在减肥的时候，减少卡路里摄入量和增加锻炼在你的生活方式中是如此重要。内分泌学家 Bartolome Burguera 医学博士说，你的身体可以在大约30分钟或一个小时的有氧运动、和大约一个小时的适度运动后开始燃烧脂肪。当身体代谢脂肪以获取能量时，它会产生热量，从而导致脂肪细胞变小。有趣的是，脂肪细胞不会消失，它们只是变小了。

Excess fat leaves the body through water and carbon dioxide, which means all of the sweat that accumulates during a workout is a sign that fat is leaving the body. Yes, you are essentially making fat cells cry when you sweat. In addition to sweat, the body eliminates fat through your breath, urine, tears and other bodily fluids, too (via Science Alert). A study published in the British Medical Journal (BMJ) took a look at how this breakdown occurs, leading researchers to believe that the lungs are the primary organs for metabolizing fat. The paper reported that the body converts 22 pounds of fat to 18.5 pounds of carbon dioxide and 3.5 pounds of water (via Science Alert).

多余的脂肪通过水和二氧化碳离开身体，这意味着所有在锻炼中留下的汗水都是脂肪离开身体的信号。是的，当你出汗时，脂肪细胞会哭。除了出汗，身体也会通过呼吸、尿液、眼泪和其他体液消除脂肪。发表在《英国医学杂志》(BMJ)上的一项研究探讨了这种分解是如何发生的，让研究人员相信肺是代谢脂肪的主要器官。该论文报告称，人体将22磅脂肪转化为18.5磅二氧化碳和3.5磅水。

So the next time you're working out and giving it your all, remember there is a mighty metabolic process taking place helping your body lose weight.

所以，下次你全力以赴锻炼的时候，请记住，有一个强大的新陈代谢过程正在帮助你减肥。