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Does Diet Green Tea Have Caffeine?
Diet green tea is a popular substitute for high-calorie, low-nutrition soft drinks, especially if you are trying to lose weight 3. If you are concerned about your overall caffeine intake, be aware that green tea does contain a significant amount of the drug. Drinking diet green tea late in the day may interfere with your ability to sleep 3.
Effects of Caffeine
Caffeine is a stimulant that affects the central nervous system, giving a feeling of alertness. According to guidelines published by the South Dakota Department of Health, 300mg per day is a moderate amount for most adults. Consuming too much caffeine can cause headache, stomachache, jittery feelings and insomnia. It can also increase your blood pressure. Some people, especially those who are not used to consuming caffeine, are more sensitive to its effects.
- Caffeine is a stimulant that affects the central nervous system, giving a feeling of alertness.
Caffeine and Weight Loss
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According to Katherine Zeratsky, registered dietitian at the Mayo Clinic, studies on the effects of caffeine on weight loss have been inconclusive 1. Some researchers have theorized that it acts as an appetite suppressant or speeds up the metabolism. Others suggest that caffeine's diuretic effects cause you to lose water weight. While the specific effects of caffeine on weight loss are not fully understood, it is unlikely to hamper your ability to lose weight 1.**
What is Green Tea?
Green tea is made from the same plant, Camellia sinesis, as black tea. The major difference is in the processing. Black tea is fermented before drying. Green tea is not 23. According to guidelines published by the University of Maryland Medical Center, green tea may be helpful in preventing and controlling a variety of diseases, including some cancers, heart disease, Crohn's disease and diabetes 2.
- Green tea is made from the same plant, Camellia sinesis, as black tea.
Caffeine Levels in Diet Green Tea
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Every brand of diet green tea is slightly different 3. Lipton Diet Green Tea With Citrus contains 12mg of caffeine per 8 oz 3. serving. Snapple Diet Green Tea contains 14mg of caffeine per 8 oz 3.** serving.
Warning
Most diet green teas are sold in 20 oz 3.** single-serving bottles, but they list nutrition information for 8 oz. servings. Unless you will divide a 20 oz. bottle into 2.5 servings, you will have to do some math to figure out how much caffeine is in your beverage. A 20 oz. bottle of green tea that lists 14mg of caffeine per serving contains 50mg of caffeine.
- Most diet green teas are sold in 20 oz 3.
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References
- Mayo Clinic: Does Caffeine Increase Weight Loss?
- University of Maryland Medical Center: Green Tea
- Snapple: Diet Green Tea
- Chacko SM, Thambi PT, Kuttan R, Nishigaki I. Beneficial effects of green tea: a literature review. Chin Med. 2010;5:13. doi:10.1186/1749-8546-5-13
- Does the National Cancer Institute (NCI) recommend the use of tea to prevent cancer? Tea and Cancer Prevention. National Cancer Institute
- Jurgens T, Whelan AM. Can green tea preparations help with weight loss? Can Pharm J (Ott). 2014;147(3):159-60. doi:10.1177/1715163514528668
- Huang S, Li J, Wu Y, et al. Tea Consumption and Longitudinal Change in High-Density Lipoprotein Cholesterol Concentration in Chinese Adults. J Am Heart Assoc. 2018;7(13) doi:+10.1161/JAHA.118.008814
- Misaka S, Yatabe J, Müller F, et al. Green tea ingestion greatly reduces plasma concentrations of nadolol in healthy subjects. Clin Pharmacol Ther. 2014;95(4):432-8. doi:10.1038/clpt.2013.241
- Brown AL, Lane J, Holyoak C, Nicol B, Mayes AE, Dadd T. Health effects of green tea catechins in overweight and obese men: a randomized controlled cross-over trial. Br J Nutr. 2011 Dec;106(12):1880-9.
- Gao, Xiang, et al. Tea Consumption and Longitudinal Change in High‐Density Lipoprotein Cholesterol Concentration in Chinese Adults. Journal of the American Heart Association; 2018; 7.
- Hajiaghaalipour F, Sanusi J, Kanthimathi MS. Temperature and Time of Steeping Affect the Antioxidant Properties of White, Green, and Black Tea Infusions. J Food Sci. 2016 Jan;81(1):H246-54.
- Henning SM, Fajardo-Lira C, Lee HW, Youssefian AA, Go VL, Heber D. Catechin content of 18 teas and a green tea extract supplement correlates with the antioxidant capacity. Nutr Cancer. 2003;45(2):226-35.
- Kokubo, Yoshihiro, et al. The Impact of Green Tea and Coffee Consumption on the Reduced Risk of Stroke Incidence in Japanese Population. Stroke; 2013;44:1369–1374.
- National Cancer Institute. Tea and Cancer Prevention.
- National Center for Complementary and Integrative Health. Green Tea.
Writer Bio
Tricia Ballad is a writer, author and project geek. She has written several books including two novels, teaches classes on goal setting and project planning for writers, and loves to cook in her spare time. She is living proof that you can earn a living with a degree in creative writing.