drinking tea before sleep help you lose weight

  While many studies focus on green tea, it's important to find a tea (green or otherwise) that you enjoy drinking. Some green teas are quite strong in flavor and can be unpleasant if you're not used to the taste -- others are truly delightful even for a beginner in green tea drinking. Here are some options to try:
Flavored green teas. Both green and white (which has antioxidant properties as well but is more expensive) are offered in a bevy of flavors. For best results, consider choosing a green or white tea that contains caffeine (according to research, a caffeine-based tea provides maximum calorie burn).

For individual green tea types, see the section on choosing your green tea in the article How to brew green tea; this article provides a detailed rundown of the different types of green tea and their properties.

Herbal teas. Herbal teas come in a variety of delectable flavors ranging from spicy orange to jasmine. Rooibos (red tea) is another good herbal tea choice. Since herbal teas are typically decaffeinated, they can be used as a late night treat or in between drinking caffeinated teas.
Black tea. It's actually from the same plant as green tea, but the processing it goes through is different. As a result, those weight loss blasting chemicals (theaflavins and thearubigins) are more complex. They're still there, but the simpler the better. In other words, green tea may get you thinner more quickly, but both are good.

Although black tea can be obtained in a decaffeinated form, trace amounts of caffeine may still remain, which can have an impact on those who want to fall asleep at night.
Oolong tea has been reported to increase your metabolism by as much as 10%. Green tea reportedly only increases metabolism by 4%. Both are great, though.

 Be careful with diet teas. While diet tea tastes similar to many black or herbal teas, diet teas may contain a laxative element, so you should drink these teas in moderation -- especially if your tea contains senna, aloe, agarwood, rhubarb root, buckthorn, or castor oil. Experts warn against drinking too many cups of diet tea because you could develop vomiting, nausea, persistent diarrhea, abdominal cramps, and even fainting and dehydration.

The concept of "diet" tea is sort of false advertising -- any unsweetened, natural tea can promote weight loss. Certain teas may act as a laxative or fat-blocker and that's why they're marketed as such. However, laxatives just clean out your colon (you've already consumed the calories). You may lose a little bit of water weight initially, but the second you drink something, it'll come back.
One cup is enough. Seriously. You'll regret drinking more.

Read your ingredient labels. There are so many types of teas on the market it's hard to know where to start. A good place to start is by reading the ingredient list on the back label. If it has added sugar or sweeteners, put it back on the shelf.

This doesn't mean you have to avoid flavored green teas. True, some have added sugar, but others don't. And if you can stick to all-natural ingredients, all the better for you and your waistline.