Amount many different weight loss solutions ,plant extracts have stand out for their effectiveness and safety .They tend to work via one or more of these mechanisms:
Reduce appetite, making you feel more full so that you eat fewer calories.
Reduce absorption of nutrients like fat, making you take in fewer calories.
Increase fat burning, making you burn more calories.
Caffeine is the most commonly consumed psychoactive substance in the world .It is found naturally in coffee, green tea and dark chocolate, and added to many processed foods and beverages.Caffeine is a well known metabolism booster, and is often added to commercial weight loss supplements.
How it works: Short-term studies have shown that caffeine can boost metabolism by 3-11%, and increase fat burning by up to 29% .
Effectiveness: There are also some studies showing that caffeine can cause modest weight loss in humans .
Side effects: In some people, high amounts of caffeine can cause anxiety, insomnia, jitteriness, irritability, nausea, diarrhea and other symptoms. Caffeine is also addictive and can reduce the quality of your sleep.
There really is no need to take a supplement or a pill with caffeine in it, the best sources are quality coffee and green tea, which also have antioxidants and other health benefits.
Green Tea Extract
is a popular ingredient in many weight loss supplements.This is because numerous studies have shown the main antioxidant in it, EGCG, to aid fat burning.
How it works: Green tea extract is believed to increase the activity of norepinephrine, a hormone that helps you burn fat .
Effectiveness: Many human studies have shown that green tea extract can increase fat burning and cause fat loss, especially in the belly area.
Side effects: Green tea extract is generally well tolerated. It does contain some caffeine, and may cause symptoms in people who are caffeine sensitive.
Bottom Line: Green tea and green tea extract can increase fat burning slightly, and may help you lose belly fat.
Green Coffee Bean Extract
are simply normal coffee beans that haven’t been roasted.They contain two substances believed to help with weight loss, caffeine and chlorogenic acid.
How it works: Caffeine can increase fat burning, and chlorogenic acid can slow the breakdown of carbohydrates in the gut.
Effectiveness: Several human studies have shown that green coffee bean extract can help people lose weight .
A review of 3 studies found that the supplement made people lose 5.4 more pounds (2.5 kg) than placebo, a dummy pill .
Other benefits: Green coffee bean extract may help lower blood sugar levels, and reduce blood pressure. It is also high in antioxidants.
Side effects: It can cause the same side effects as caffeine. The chlorogenic acid in it may also cause diarrhea, and some people may be allergic to green coffee beans.