L-theanine is an amino acid naturally present in tea, including green tea. activate a type of fat called brown adipose tissue (BAT), whose quantities decrease as you ageīAT has the potential to produce large amounts of heat and modulate fat and glucose metabolism ( 35, 36).It also helps promote the growth of beneficial bacteria in the gut, which help burn fat and improve insulin sensitivity, among other beneficial effects ( 31, 32, 33).įurthermore, studies have found that caffeine is associated with weight loss. Similarly, animal studies show that EGCG also leads to weight loss and reduced visceral fat by promoting fat breakdown ( 31). It’s linked to an increased risk of heart disease and diabetes ( 30). Visceral fat is the fat stored inside the abdomen around the organs. Weight loss effectsĬoffee’s CGA and green tea’s EGCG, together with caffeine, provide both drinks with weight loss properties.Īnimal studies show that CGA may lower insulin, blood cholesterol, and triglycerides in the blood, as well as reducing weight and visceral fat ( 29). In contrast, coffee’s CGA may have beneficial effects against liver, endometrial, and skin cancers ( 21).Īdditionally, CGA may also benefit heart health and blood sugar control by regulating blood triglyceride levels and improving how your cells respond to the hormone insulin ( 23, 27, 28). Studies suggest that EGCG in green tea may have a beneficial effect against cancer cells in head and neck tumors, as well as in lung, prostate, breast, colorectal, and pancreatic cancer cells ( 21, 26). On the other hand, CGA appears to inhibit tumor growth and promote cancer cell death ( 21, 23). Its anti-inflammatory effect may help prevent the chronic inflammation involved in the onset of cancer ( 21). Studies in test tubes, animals, and humans suggest they may have potent anticancer effects ( 21, 22, 23).įor instance, EGCG may hinder tumor growth and spread, and it may lead to tumor cell death ( 24, 25, 26). In both drinks, these are responsible for many of their benefits and flavor ( 20).Įpigallocatechin gallate (EGCG) and chlorogenic acid (CGA), are the most abundant polyphenols in green tea and coffee, respectively. They’re both particularly rich in a group of antioxidants called polyphenols. Luckily, coffee and green tea are loaded with antioxidants - compounds with beneficial effects against oxidative stress. Oxidative stress is a harmful process that can negatively affect your health by causing disease and speeding up the aging process ( 19). However, in excess, they lead to oxidative stress. Great antioxidant sourcesįree radicals play numerous beneficial roles in your body. Green tea and coffee have multiple health benefits in common, including their high antioxidant content and weight loss effects. However, coffee provides about three times the amount of caffeine as green tea. SummaryĬaffeine is a stimulant drug naturally found in coffee and tea. Scientists need to do more research on the potential effects of caffeine. However, research on caffeine and diabetes seems inconclusive, and further evidence suggests that it may actually increase blood sugar levels ( 17, 18). Some studies have even linked caffeine intake with a lowered risk of developing type 2 diabetes ( 14, 15, 16).
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