I'm not sure if it was because he was getting too comfortable or because his adolescent skinny boy metabolism was just growing into middle-aged fat man metabolism.

我不能肯定这是因为他过得太舒适了，还是因为他那种青少年时期的小瘦子的新陈代谢系统直接过渡到了中年胖男人的新陈代谢系统。

youdao

The more lean body mass (LBM) you have the higher your metabolism… and a higher metabolism stimulates your body to burn fat for energy!

更多的瘦肌肉加快你的新陈代谢，并且新陈代谢能燃烧你身体的脂肪变成能量。

youdao

Red-promote metabolism, quickly burn fat inside the body. The red food can promote metabolism, make the fat that contains in the food direct burnable.

红色食物能够促进新陈代谢，使蕴含在食品中的脂肪直接燃烧。

youdao

If you have a brain, and a body, and a metabolism that wants calories, it wants fat, it wants sugar, it wants a broad variety of food so you can survive, that would be good if you lived in certain parts of the world today.

如果你有大脑,有身体,有新陈代谢,这些都需要能量,就需要脂肪,需要糖,需要极其多样食物,你才能活下来,世界上只有部分地区可以保证这些

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The ones who would seek out calories, the ones who could store and not waste energy, those with an efficient metabolism-- that is those people who took in calories and banked them into their body fat and stored against subsequent famine-- are the ones who would do the best under these circumstances.

那些寻找能量的人,那些储存而不浪费能量的人,那些有着高效代谢系统的人,那些人可以将摄入的热量储存为机体脂肪,以用于对抗即将到来的饥荒,在早先的情况下他们是最适应环境的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

But they argue that this is probably because they inadvertently consume fewer calories, rather than because of the mechanism suggested by Dr Atkins whereby the body switches from a carbohydrate-burning metabolism to a mainly fat-burning metabolism.

ECONOMIST: Dieting

Secondly, losing weight too quickly when you don't have a significant amount of weight to lose can result in muscle loss as well as fat loss, which can decrease your metabolism and make it more difficult to maintain your weight loss.

CNN: Is it possible to lose 15 pounds in one month?

In a study published in the American Journal of Clinical Nutrition, green tea extract increased energy expenditure, which is a measure of metabolism, plus it had a significant effect on fat oxidation, or how much fat your body burns.

CNN: Five 'eating better' foods to slip into your diet in '10