Nate: No. Dieting usually means that people sacrifices certain foods but only for a short time. After the diet ends, almost everybody goes back to their old ways of eating.
Carla: OK. But if a diet works, why not get back on it whenever you need to drop a few pounds?
Nate: Well, what’s the point in working so hard to lose weight, only to gain it all back again? Besides, it’s not good for your body to keep yo-yo dieting.
Carla: But sometimes you want to lose weight really quickly, and some of the new diets can help you accomplish that.
Nate: It’s not worth it, though, because many of the fad diets are just unhealthy. For instance, extremely low-calorie diets can cause you to lose muscle tissue, and others can increase your risk of heart disease.
Carla: So what should you do to sustain weight loss?
Nate: Instead of just trying to reach a certain number on the scales, you need to develop some healthy habits.
Carla: Like what?
Nate: I know you’ve heard it before, but healthy foods and regular exercise really are the keys to keeping weight off.
Carla: OK. You’ve convinced me. From now on, I’ll focus on getting trim the healthy way!
sacrifice v. 捨棄/犧牲
eg: Mandy and her husband sacrificed a lot to support their kid’s education.
=> Mandy和她的老公為了支持孩子們的教育犧牲很多
eg: Many people sacrificed their time to volunteer for the charity campaign.
=> 許多人犧牲自己的時間志願參加這個公益活動
sacrifice n. 捨棄/犧牲
eg: Sometimes we forget how much of a sacrifice our parents make for us.
=> 很多時候我們會忘記父母親為我們犧牲了多少
yo-yo diet 一下子節食，一下子放縱大吃的溜溜球節食法
eg: The government’s yo-yo tax polices were strongly criticized by the people.
=> 人們嚴厲地批評政府搖擺不定的稅法
sustain v. 維持/保持
eg: To sustain the present rate of sales growth, we need to find new ways to merchandise our products.
=> 如果要保持目前業績成長的速度，我們必須找到新的產品銷售方式。
eg: The coach required harder training of our team in order to sustain our momentum.
=> 教練要求我們球隊作更困難的訓練來保持我們的動力
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