. Water flushes out your system, removing unneeded toxins, making it easier to lose weight. Moreover, water is free of calories, making it a much better choice than sugary drinks. In fact, if you can limit yourself to only water, your odds of losing the weight will increase. If you need something flavored from time to time, choose unsweetened tea.  This should be 24/7, apart from right before a workout. Then you can feel free to chug a cup of black coffee (or with a splash of skim milk). The caffeine blast is reported to give you a kick, making you work out a little bit harder.  It turns out drinking water can up your metabolism, too, in addition to making you feel full. Recent studies show that drinking two glasses of cold water can up your metabolism about 40% for 15-20 minutes. Participants in these weight loss studies reportedly lost 15 pounds in three months, largely by drinking only water. Cut it out completely. Someone following a standard diet can usually afford to fall off the junk food wagon once or twice without suffering major repercussions. For more extreme, short-term weight loss goals (like this one), however, junk food must be completely avoided.  Stay away from greasy, fatty foods as well as those with a high sugar content. Anything battered, fried, covered in chocolate, packaged, or loaded up and preserved with sugar is a no-go. Be sure to read your labels. Even things like yogurt and granola bars can be powerhouses of sugar. While many people think of these as healthy, they're actually not. Everything from pasta to cookies is full of simple carbohydrates that are actually sugars in disguise. These little villains spike our insulin levels, upping our fat stores, and ultimately increase our body weight. To lower the spike, cut out the processed carbs – that means white rice, bread, and potatoes, in addition to cookies, cakes, donuts, chips, pretzels, and ice cream.  You may be better off cutting out carbs in general. Let's face it: 20 pounds in 2 weeks is a tall order. To put your body in...

How would you rephrase that briefly using Vietnamese?
Chuyển sang chỉ uống nước tinh khiết. Loại bỏ đồ ăn vặt ra khỏi chế độ ăn của bạn. Loại bỏ tinh bột. Ăn các thực phẩm có "calo âm". Chọn các loại đạm nhiều nạc và ăn thật nhiều rau. Hãy cân nhắc thận trọng chế độ ăn kiêng tạm thời.