人之所以会长胖，根本原因是摄入的能量多于消耗的能量，多余的能量就转化成

人之所以会长胖，根本原因是摄入的能量多于消耗的能量，多余的能量就转化成脂肪储存起来。而人到了中年，身体发生了变化，代谢率自然地缓慢下来，使得身体的能量消耗减少。另一个变化是，从大约30岁起，人的肌肉量开始丧失。肌肉量丧失的一个原因是生长激素的分泌显着减少，而生长激素对促进、维持肌肉的发达至关重要。另一个原因是人们到中年后生活习惯发生变化，运动少了，肌肉缺乏锻炼，也会自然地萎缩。肌肉运动是很耗费能量的（即使在你安静的时候，肌肉也在耗费能量），肌肉量少了，也就意味着身体的能量消耗少了。而运动量少，本身就减少了能量消耗。所以，人到中年时，由于各方面的原因，身体的能量消耗明显少了，但是饮食习惯通常并没有明显改变，饭量还和以前差不多甚至吃得更多，多吃的那些饭就变成了脂肪。

人之所以会长胖，根本原因是摄入的能量多于消耗的能量，多余的能量就转化成脂肪储存起来。 而人到了中年，身体发生了变化，代谢率自然地缓慢下来，使得身体的能量消耗减少。 另一个变化是，从大约30岁起，人的肌肉量开始丧失。 肌肉量丧失的一个原因是生长激素的分泌显著减少，而生长激素对促进、维持肌肉的发达至关重要。 另一个原因是人们到中年后生活习惯发生变化，运动少了，肌肉缺乏锻炼，也会自然地萎缩。 肌肉运动是很耗费能量的（即使在你安静的时候，肌肉也在耗费能量），肌肉量少了，也就意味着身体的能量消耗少了。 而运动量少，本身就减少了能量消耗。 所以，人到中年时，由于各方面的原因，身体的能量消耗明显少了，但是饮食习惯通常并没有明显改变，饭量还和以前差不多甚至吃得更多，多吃的那些饭就变成了脂肪。

The reason why people gain weight is that they consume more energy than they consume, and the excess energy is converted into fat for storage. In middle age, the body changes, and the metabolic rate slows down naturally, which reduces the body's energy consumption. Another change is that from about 30 years old, people begin to lose muscle mass. One of the reasons for the loss of muscle mass is that the secretion of growth hormone is significantly reduced, and growth hormone is essential to promote and maintain muscle development. Another reason is that people's living habits change after middle age, less exercise, lack of muscle exercise, will naturally atrophy. Muscle movement is very energy consuming (even when you are quiet, muscle is also energy consuming). Less muscle means less energy consumption of the body. Less exercise reduces energy consumption. Therefore, in middle age, due to various reasons, the body's energy consumption is significantly less, but the eating habits are usually not significantly changed, the amount of meals is almost the same as before, or even eat more, and those more meals become fat.<BR>