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After 5 minutes of rest following the step test, participants who consumed more than 600 mg of caffeine per day had significantly elevated heart rates as well as noticeably higher blood pressure.
The study found any caffeine intake in general reduced risks of CM, although did not find strong evidence that tea reduced the risk of stroke and Type 2 Diabetes. By contrast, a 2011 review had found that drinking one to three cups of coffee per day may pose a slightly increased risk of developing hypertension. [22]
[45] [46] The United Kingdom Food Standards Agency had recommended that pregnant women should limit their caffeine intake to less than 300 mg of caffeine a day, but in 2009 revised that downward to less than 200 mg of caffeine a day. [47] High doses of caffeine intake during pregnancy may increase the risk of miscarriage [48] and some major ...
High doses of caffeine (750 to 1200 mg/day spread throughout the day) have been shown to produce complete tolerance to some, but not all of the effects of caffeine. Doses as low as 100 mg/day, such as a 6 oz (170 g) cup of coffee or two to three 12 oz (340 g) servings of caffeinated soft-drink, may continue to cause sleep disruption, among ...
High caffeine levels linked to elevated heart rate, blood pressure. Scientists found that chronic intake of 400 mg of caffeine daily showed a significant impact on the autonomic nervous system ...
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If pregnant, it is recommended not to consume more than 200 mg of caffeine a day (though this is relative to the pregnant person's weight). [26] If a pregnant person consumes high levels of caffeine, it can result in low birth weight due to loss of blood flow to the placenta, [27] and could lead to health problems later in the child's life. [28]
Caffeine is energizing, but if it's impacting your sleep, it may be time to scale back.