Why tea is not good for weight loss?

People around the world drink tea. Hundreds of varieties exist, from white to black and green to oolong. They all naturally have high amounts of health-promoting substances called flavonoids. So they’re thought to bring down inflammation and help protect against conditions like heart disease and diabetes.

But can tea help you lose weight?

A cup of this herbal brew each day isn't likely to get you back into your skinny jeans. But some research suggests tea may help you lose a very small amount of weight when you pair it with a sensible diet and exercise. And consider this: If you swap out your morning mocha latte for a cup of tea with lemon, you'll trim almost 300 calories from your daily total.

Teas have a type of flavonoid called catechins that may boost metabolism and help your body break down fats more quickly. And the caffeine in many teas increases your energy use, causing your body to burn more calories. These two compounds probably work best together for any weight loss that may occur.

Once you've lost weight, tea could help you keep it off by preventing the metabolism slowdown that's common after dropping a few pounds.

All tea types come from the same leaves--Camellia sinensis. But the leaves are processed in different ways and each tea is a little different.

Black Tea

This is the type of tea that's often used to make iced tea. It goes through a process of oxidation -- a process that allows it to change chemically and often increases its caffeine content. The tea has a strong, rich flavor. Whether it helps with weight loss isn't certain. But research done on rats suggests substances called polyphenols in black tea might help block fat from being absorbed in the intestines.

Watch what you pour into your tea, though. Drinking black tea the English way -- with milk -- might curb its fat-blocking abilities.

Green Tea

Green tea usually isn’t oxidized. The leaves are simply steamed and then crushed by hand.

It’s especially high in the most potent type of catechin, called EGCG. Some studies have shown that people who took an EGCG-rich green tea extract or drank catechin-enhanced green tea lost a modest amount of weight (about 3 pounds over 3 months). 

To get the same amount of EGCG used in the research, you'd need to drink about six to seven cups of your typical green tea every day. Green tea extracts can be risky. Though rare, high-dose tea extracts found in some weight-loss supplements have been linked to serious liver damage.

Oolong Tea

This tea is made by withering tea leaves in the hot sun and then put through an oxidation process. Like green tea, it's a rich source of catechins. In one study, more than two-thirds of overweight people who drank oolong tea every day for six weeks lost more than 2 pounds and trimmed belly fat.

White Tea

This tea is the least processed, and it has a light, sweet flavor. Is it as pleasing to the waistline as it is to the palate? One laboratory study showed white tea sped up the breakdown of existing fat cells and blocked the formation of new ones. Whether it has the same effects in the human body remains to be seen.

The Final Word on Tea

If you like a cup of tea with your morning toast or afternoon snack or on its own, enjoy it. It’s safe to drink as long as the caffeine doesn't make you jumpy. And it may even help protect against cancer, diabetes, and heart disease.

A few cups of daily tea might even give you a slight push toward your weight-loss goals. Just don't expect miracles to come in a teacup. Real weight loss requires a whole lifestyle approach that includes diet changes and activity.