Green tea is cold in nature while red tea is warm in nature. Drinking tea everyday will decrease cholesterol levels and benefit the cardiovascular system. Tea should be avoided from midday onwards by people with insomnia as it contains caffeine. Tea is best drunk without milk and sugar, because these will reduce the alkalizing benefits of tea. Tea is very good at clearing damp and acid. Tea is also very good externally at cleaning wounds (obviously without milk and sugar!) It is best to drink green tea in the summer as it is cooling, and black or oolong in the winter, which are warmer.