Be careful with your daily green tea intake
Green tea has long been hailed as a yellow drink that helps keep alert, fight oxidation and supports weight loss. However, drinking too much can be counterproductive.
According to nutritionist Regina Windsor (USA), green tea contains caffeine and catechin, two active ingredients that can affect the nervous system and cardiovascular system if consumed in excess. Drinking more than 4 cups of tea a day can cause restlessness, rapid heartbeat or insomnia, especially in people who are sensitive to caffeine, says Windsor.
Caffeine may have a stronger impact if you are taking cardiovascular medication or anxiety medication at the same time. Many studies have shown that adults should only consume a maximum of 400 mg of caffeine per day, equivalent to about 6 - 8 cups of light green tea.
Risks for cardiovascular, liver and digestion
Dr. Sohaib Imtiaz, Medical Director of Lifestyle Medicine (UK), warned: Green tea helps support the heart, but too much caffeine can temporarily increase heart rate and blood pressure. People with heart disease should consult a doctor before using it every day".
In addition, catechin in green tea can affect the liver if consumed in large, regular amounts. Some studies have recorded liver damage in people who drink a few liters of tea per day.
The digestive system is also affected when consuming tea on an empty stomach, tanin and catechin can cause nausea, reflux or mild diarrhea. Green tea also hinders the absorption of iron and some medications such as statins, methotrexate or cyclosporine.
How to drink safely for health
To enjoy the benefits without harming, experts recommend drinking only 2 - 3 cups of green tea per day, avoid drinking after 5pm to avoid affecting sleep. Do not drink tea on an empty stomach, and be at least an hour away from meals to avoid reducing iron absorption.
Green tea is still a healthy choice if used properly. However, like any food with strong bioactive ingredients, comeback to normal, Dr Imtiaz emphasizes.
The information in the article is for reference only, not a replacement for medical diagnosis or treatment. You should talk directly to your doctor for accurate advice that is suitable for your health condition.
