Caffeine, in combination with the amino acid L-theanine which is also in green tea, helps improve brain function. It can also slow down the impact of aging on brain neurons, in particular, fighting off diseases like Alzheimer’s. Small studies have shown that green tea can increase the body’s metabolic rate, thus burning more energy and producing weight loss. The many anti-oxidants and nutrients in green tea attack free radicals in the body, helping defend the body against various types of cancers.
The same catechins which are such powerful antioxidants also have antibacterial properties and are particularly helpful in keeping mouth bacteria under control and reducing tooth decay and bad breath. By improving insulin sensitivity and reducing blood sugar levels, green tea helps people with diabetes or who are high risk for diabetes. The overall benefits of green tea – indeed all the foods listed here – mean that it can contribute to a longer and healthier life.