Chewing gum regularly allows you to swallow more air.  This can cause bloating or make it worse.  Carbonation also can make you feel bloated.  Instead of chewing gum, try a mint or brush your teeth or use mouthwash to freshen breath. Instead of carbonated beverages, stick with non-carbonated, hydrating fluids like:  water, flavored water, decaf coffee, or decaf tea. Adequate rest is also very important for quick results.  Aim for at least seven to nine hours of sleep each night. Not only does sleep help to destress and re-energize the body, adequate sleep also helps stave off carbohydrate cravings.  Try to go to bed early each night.  Turn off all the lights, electronics and anything that makes distracting sounds.  Doing these things can make sure you have a sound and restful sleep.  Sleep also helps you relax and de-stress.  So if you're nervous or stressed about your event, getting adequate sleep can help you manage your emotions better. If you're trying to lose extra weight in just a few days you might be a little stressed or worried.  However increased stress may make you feel more tired, lethargic or possibly make you more prone to stress eating.  Cortisol is a hormone released when you're stressed.  When you have low levels of this hormone in your body, you may have more difficulty losing weight.  Each day of your two day diet, plan for some self-reflection and times for relaxation.  Spend a few minutes listening to relaxing music, reading a book, meditating, or going for a relaxing walk.

How would you rephrase that briefly using Vietnamese?
Bỏ kẹo cao su và nước uống có ga. Ngủ đủ giấc. Giảm căng thẳng.