What Happens to Your Immune System When You Drink Green Tea

Green tea is packed with antioxidants that can support immune health. These plant compounds help protect immune cells from damage and may reduce inflammation over time.

Green tea is rich in antioxidants called catechins, including epigallocatechin gallate (EGCG). These compounds help protect your cells from oxidative stress, which occurs when unstable molecules called free radicals damage healthy tissues. Too much oxidative stress can disrupt the functioning of immune cells, making it harder for your body to fight infections.

Inflammation is part of your body’s natural defense system. When you get sick or injured, it helps your immune system respond. But chronic inflammation that persists over time can put strain on immune cells and weaken their function.

Catechins in green tea have been shown to regulate inflammatory signaling pathways in the body, helping to prevent prolonged inflammation that can weaken immune cell function over time.

Much of your immune system is located in your gut. The billions of bacteria that live there help regulate immune activity and communicate with immune cells.

Some research suggests that green tea may promote the growth of beneficial bacteria and slow the growth of harmful bacteria in the gut.

This may be due to compounds called polyphenols, which can act as prebiotics. Prebiotics help feed the good bacteria in your gut. A healthy balance of gut bacteria is linked to stronger immune function.

Green tea doesn’t treat infections on its own, but early research suggests its catechins may help slow the growth of certain bacteria and viruses. These compounds may help reduce the ability of certain bacteria to multiply.

The antioxidants in green tea may be especially helpful during cold and flu season. In a 2018 study, people who drank green tea had fewer cold symptoms than those who didn’t drink it.

Chronic stress can weaken immune function. When stress hormones like cortisol remain elevated for long periods of time, the immune response is reduced.

Green tea contains L-theanine, an amino acid that promotes calm concentration. Some studies suggest that green tea may help improve mood and reduce symptoms of depression. This may indirectly support immune health.

If you want to boost your immune system with green tea, try drinking 1 to 3 cups per day as part of a balanced lifestyle.

To get the most out of it:

• Prepare green tea with hot but not boiling water; this helps preserve the active compounds in the tea
• Try drinking green tea without added sugar, as too much added sugar can negate the health benefits of green tea.
• Choose decaffeinated green tea if you are sensitive to caffeine

Green tea does not cure the disease. But coupled with adequate sleep, a balanced diet, regular movement and stress management, it can be a simple way to support your immune health.