As far as the origins of each of the teas, they actually both come from the same plant – camellia sinensus. The differences between the two come into play in relation to when they are harvested, as well as the way they are each processed. White tea consists of very young buds and leaves while the leaves found in green tea are mature. Both types of tea undergo a minimum of processing, but white tea is fast-dried and not fermented at all, while green tea is either roasted or partially fermented, although not to the degree that other teas are (like oolong and black tea). The low level of processing involved in the creation of both teas is what makes it possible for both of them to retain their natural health benefits to such a high degree.

When it comes to the antioxidant level in each of the teas, studies have shown that white tea typically contains a much higher concentration than green tea does – up to three times higher, in fact. This is due to the fact that although green tea undergoes minimal processing, white tea goes through almost none, allowing it to retain such high levels of antioxidants, and for most white tea enthusiasts, the higher level of antioxidants is usually the main reason for choosing it.

When it comes to caffeine levels, white tea generally contains a slightly lower amount than green tea does because it is harvested while it is still quite young. For those watching their intake of caffeine, or who have trouble with problems such as insomnia, white tea may be a better choice for this reason. However, it is also important to note that caffeine levels will further vary depending on the specific variety of the tea in question.

Both green and white teas are also notable for their natural antiviral and antibacterial properties. They’ve been known to help fight and alleviate the symptoms of many bacteria or virus related ailments including the common cold, the flu, and even some of the symptoms associated with HIV and AIDS. However, white tea is generally considered to be superior when it comes to this angle as well, and the reason once again is the minimum of processing it goes through, allowing the tea to retain more of its natural properties.

Another determining factor for some tea drinkers may be flavor or price. Since white tea is harvested during a very specific span of time in the spring and handled with kid gloves, it’s generally more expensive than green tea is. It is also milder in flavor, lighter in color, and lacking in the “grassy” quality that can be present in green tea and unpleasant to some palettes. However, many tea drinkers often find that they enjoy the flavors of both teas and will alternate between the two.

The benefits of regularly drinking green tea have often been compared to those associated with the drinking of red wine. Red wine contains a polyphenol called resveratrol which has been clinically proven to help lower the health risks associated with such unhealthy practices as a high fat, high cholesterol diet, or excessive smoking. Recent studies have not only shown that EGCG works very similarly to resveratrol as far as its beneficial effects on the body, but that it is actually up to twice as effective, making it a viable alternative to wine for many, especially those who would rather not consume alcohol.

As a powerful antioxidant, the EGCG present in green tea also packs a powerful punch when it comes to the prevention and treatment of many other ailments as well. It helps prevent premature aging and improve the overall health and appearance of the skin. It helps lower cholesterol, promote healthy circulation, and improve the health and functionality of the immune system. It’s also thought to lower one’s chances of developing many debilitating, degenerative diseases such as Alzheimer’s, multiple sclerosis, and Parkinson’s disease. Green tea has even been proven to help prevent halitosis, tooth decay, and plaque by killing harmful bacteria that can quickly grow out of control in the mouth, causing these problems in the process.

As far as any negative side effects associated with the consumption of green tea, there really aren’t many aside from those associated with the consumption of any beverage containing caffeine. These include trouble sleeping, excessive urination, and stomach upset. However, in comparison to coffee or other kinds of tea, such as the commonly consumed and ubiquitous black tea, green tea contains a relatively low level of caffeine. Decaffeinated varieties are even available on the market for the use of those that prefer to experience the miracle of green tea without consuming any caffeine at all.

For more information, you can visit the Wikipedia Green Tea page or read more about the health benefits of green tea.