I like my green tea and usually have at least 2 cups a day, but according to the results of a study at the USDA Human Nutrition Research Centre on Aging at Tufts University, people who drank "3" cups of green tea a day lost twice as much weight as those not drinking tea. And important to note, the tea-drinking group lost significantly more belly fat than the non-tea drinkers!
Catechins, those antioxidants we keep hearing more & more good things about, are found in high amounts in green tea and they've been shown to be helpful in promoting weight loss, specifically belly fat.
Now if you're concerned about the little bit of caffeine that's in green tea (caffeine content of a cup of green tea depends greatly on the type of tea and how it is prepared - sources quote anywhere from 3 to 30 mg of caffeine in a cup of green tea; regular tea contains between 30 and 60 mg; a can of Coke contains 34 mg; instant coffee contains between 65 and 100 mg & drip filtered coffee can contain up to 200 mg) decaf green tea is available. However some decaffeination processes can lower the antioxidant content of tea so you should add an extra cup or two over and above the 3/day.
An additional tip: Replacing some of the tea brewing water with citrus juice, such as lemon, lime, orange, or grapefruit, allows your body to use more of the tea’s catechins! I'm sure adding a slice or two of the citrus fruit would work as well. But don't add milk, as it inhibits the absorption of the tea's healthful properties.
Drinking green tea hot or cold is good either way, but I don't believe the powdered green tea drinks are of much benefit, if any.
So it looks like it's in our best interests to up the ante and increase our green tea intake to at least 3 cups - bottoms up! And here's to less belly fat - Cheers!!!
Tea is a cup of life. ~ Author Unknown
Tea does our fancy aid,
Repress those vapours which the head invade
And keeps that palace of the soul serene.
~ Edmund Waller, "Of Tea"