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). quickened reaction times and improved accuracyĮvidence also suggests caffeine has protective effects on brain health, reducing the risk of dementia and other degenerative diseases ( 11, 12, 13).increased energy levels, alertness, attention, and wakefulness.However, the recommended limit drops to 100 mg per day for teenagers and 2.5 mg/kg per day for children ( 2).Ĭaffeine is one of the most studied substances, due to its multiple beneficial health effects. An 8-ounce (240 mL) serving of coffee provides 96 mg of caffeine, while the same amount of green tea provides 29 mg ( 5, 6).Īccording to research, intakes of 400 mg of caffeine per day are considered safe for adults.
However, coffee provides more than three times the amount of caffeine than green tea.
In fact, coffee and tea are often the most predominant sources of caffeine in a person’s diet ( 2, 3, 4). Caffeine is the most widely consumed stimulant drug worldwide, and it’s naturally found in coffee and tea.