推荐回答（5个）
其实很大的因素与遗传基因与家庭的饮食习惯以结构有关。瘦人怎么吃都不长肉的根本原因是胃肠对营养的吸收功能出现障碍及脾胃内分泌失调造成的。
而胖人之所以会胖，除了吸收功能好以外，还因为：
1、饮食因素：热量摄入过多，尤其高脂肪或高糖饮食均可导致脂肪堆积。
2、活动与运动因素：运动是消耗能量的主要方式。运动减少，能量消耗降低，未消耗能量以脂肪储存于全身脂肪库中。
3、神经精神因素。
4、代谢因素：合成代谢亢进
5、内分泌因素：胰岛素分泌偏多，且又存在胰岛素抵抗，脂肪细胞膜上胰岛素受体较不敏感，脂肪细胞上单位面积的胰岛素受体密度减少，也促进脂肪合成。
脂肪30以上的就是肥胖科学证明一公斤脂肪一天只消耗6卡,一公斤肌肉一天要消耗100卡,你们可以去想想一般人认为少吃+运动就可以减肥.这是一个不完全正确的方法你运动先减去的是水分再减的是肌肉群(也就是蛋白质)最后才是脂肪,往往要减到脂肪时,很多人就坚持不住了,就要复食,就会比以前更胖,那是因为运动完后人体的吸收是平时的两倍,所以会变胖,所以正确的减重观念是:少吃+运动+均衡的营养
这才能避开肌肉群减到脂肪.人一天最低需要摄入1000大卡热量两餐代餐奶昔产生200大卡×2=400大卡普通正餐一餐约为600大卡
三餐之和为1000大卡正常人消耗热量一天2000-2400大卡所缺少的1000-1400大卡就须要燃烧脂肪来补足（只有营养均衡的情况下才会燃烧到脂肪，不然只会消耗肌肉，比如节食。而失去的肌肉是马上会反弹的）一周消耗7000-9800大卡7700大卡热量=1公斤脂肪
一周减0.91-1.27公斤
所以一个月约减4--5公斤
这种减肥方法符合人体自然代谢原理，是世界公认最健康有效的减肥方法。`
与遗传和饮食习惯有关
比如我，家传比较瘦，我不管怎样吃，还是偏瘦
还有些人，喜欢吃高热量食品又不爱运动，只好长胖了
也有一些人，营养不良，吃不饱，怎么也长不胖
cyano说得好，也算是自然界的审美平衡，大家有胖有瘦，看起来协调
这其中有部分是遗传因素。当然这跟后天也有一定因素。
如果你多吃少运动，那也许很快就胖了。睡眠太足或太少会引起发胖哦。
所以为了不胖不瘦，就要合理安排饮食，合理作息，适当运动。
因为每个人的的吸收效果不同,还有跟家人的遗传因素也有关系的是天生,当然也有后天的因素啦就是跟饮食和睡眠也是有很大的关系的!
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