Elevated cortisol level weakens the immune system. Research shows that having a habit of drinking black tea is the quickest way to reduce cortisol production. This has important, because slow recovery following acute stress has been associated with a greater risk of chronic illnesses such as coronary heart disease.
1.Black tea soothes away stress
2.The effects of tea on psychophysiological stress responsivity and post-stress recovery: a randomised double-blind trial
3.Antioxidant Activity of Black Tea vs. Green Tea
4.Black and Green Tea: How do they differ (a Word doc)
5.Health Benefit of Green Tea