Is drinking 4 cups of green tea every day unhealthy?

Not an expert here, but green tea has less caffeine than black tea or coffee, and definitely less then energy drinks. Four cups a day shouldn't be any concern, which you're probably finding already seeing as you're not having any trouble sleeping.

No, I don't think so. Green tea has many benefits, and many experts don't believe one cup a day will allow you to absorb all its benefits. Daily recommended intake of green tea varies according to various experts so I think 4-5 cups a day is fine, and I personally don't even have the discipline to do so! Good for you!

Drinking 4 cups of green tea is a healthy practice. as long as you are comfortable with it sources from Red Leaf Tea Blogs indicate the health benefits of Green teaGreen tea may have been the healthiest drink that you can find today. Among other drinks, it has the most number of health advantages that promote healthy living. This drink has made its way to become the all time favorite of tea drinkers and people who want to live long and stay health.AntioxidantsMany studies and researches have proven the claim of the nutritional benefits of green tea. Much of the contribution of green tea to improve health is the richness in antioxidants. Green tea has a powerhouse of antioxidants known as catechins. Catechins in green tea inhibit harmful molecules to enter the body organs, thus preventing the development of certain diseases. They help the immune system to strengthen body tissues and organs. They collaborate with the immune system in protecting the body against illnesses and diseases.Fat OxidationGreen tea increases fat oxidation. Fats are broken down and converted into energy. Thus, green tea can decrease the rate of weight increase. So much so that green tea is effective in weight management. Unwanted fats are eliminated while energy is increased.Increase MetabolismOne of the most appreciated benefits of green tea is its capacity to increase metabolism by 35 – 40%. This allows green tea to burn excess calories that may also contribute to the increase in weight. The boost in metabolism also scales up the removal of toxins from the body. This makes bowel movement easy and better.Sustained EnergyGreen tea has the capacity to sustain energy in the body. It has a certain type of caffeine that is absorbed by the body in small quantity resulting to a high energy level that lasts for about 4 to 5 hours. This benefit makes the mind alert and mentally focused. The body is also kept active throughout the day.image source from: http://matchaoutlet.com/matcha/

Fast weight loss – Even though many nutritionists recommend green tea as one of the ingredients for weight loss, nothing in its structure will help you to quickly reduce weight. However, if you structure your diet correctly, regular use of green tea can stabilize your metabolism and help you reinforce your already established weight loss plan. You can drink as much as you like safely – Drinking large amounts of green and black tea can cause problems for your health and metabolism, and you need to pace yourself and drink less than 10 cups per day. Green tea contains caffeine which can cause tremors, polyphenols can cause indigestion, if the leaves were treated with pesticides, they can add up and slowly poison you, and more.Black and Green tea are extracted from different plants – False! Both Green and Black tea leaves are taken from the same plant. Different color is achieved because of different tea processing.(for losing weight with green tea, visit this link: http://www.amazon.com/Applied-Nutrition-Burner%C2%AE-Liquid-Softgels/dp/B0016FYHZ2%3Fpsc%3D1%26SubscriptionId%3DAKIAILEBHQKNSLOTQ72A%26tag%3Dmybodo-20%26linkCode%3Dxm2%26camp%3D2025%26creative%3D165953%26creativeASIN%3DB0016FYHZ2) Black Tea Has More Caffeine – This is not true. Black tea is created from the green leaves of green tea, but procedure for creating black leaves zero impact on the amount of caffeine.Green tea cannot promote cancer – False. Studies have shown that really large intake of green or black tea can promote throat cancer. Don’t drink it too much every day!Facts:Promotes stronger bones – Yes, minerals and other components of the green tea can strengthen bones in people who drink it daily. If you want to prevent Osteoporosis and other bone-related problems, drink one or two cups of green tea each day.Prevents cancer – Regular and moderate intake of green tea can indeed prevent appearance of cancer, but that is true for almost every other natural tea. Green tea however has larger amounts of Catechin, substance that prevents buildup of enzymes that are needed for growth of cancer cells.Treats acne – Extracts of green tea are often used in cosmetics. For example Green Tea Oil is very popular ingredient for treating acne, skin spots and skin health.Stabilizes cardiovascular system – Regular intake of green tea can very efficiently moderate functions of your heart and blood, reducing levels of bad cholesterol, remove blood clots and much more.Note: All figures are approximate; this site does not provide medical advice, diagnosis or treatment.

I would say no as long as the caffeine isn't disrupting your sleeping pattern or making you jittery.  I would make sure the green tea is organic if you're drinking it daily. 

I believe the math is 4 cups of green tea is roughly equivalent of one cup of coffee, so if you're drinking 4 cups of green tea and 1 cup of coffee everyday then that's roughly equal to 2 cups of coffee, which is within the recommended daily amount. Now, whether or not we should be strict in terms of 1 cup = 8 oz., that's something to take into consideration. Most people probably drink minimally 12 oz. for a cup/mug size...

I am drinking green tea up to 5 cups a day now. It is healthy and for long i suffered of dehydration due to the fact i drank little water and soemtimes worked in physically demanding jobs or/in indoor environments. Now i am trying to change my habits and drink more water and tea. Tea helps me a lot and let me sleep at night (unlike earl grey and others...) Green tea is in my oppinion one very good choice.

Green tea rocks! I drink around 4 cups average a day with no caffeine-related problems, green tea acts as a natural antihistamine, which helps me a lot.