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"If you sense that you may be a slow metabolizer of caffeine, it is best to limit caffeine to a maximum of 200 milligrams per day and stop all caffeine intake at least eight hours before bedtime ...
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]
A small, 8.4-oz. can of Red Bull contains 80 mg of caffeine, and a concentrated, 2-oz. energy shot can contain a staggering 215 mg, according to the Mayo Clinic. Just how any one person will react ...
The metabolism of caffeine is reduced in pregnancy, especially in the third trimester, and the half-life of caffeine during pregnancy can be increased up to 15 hours (as compared to 2.5 to 4.5 hours in non-pregnant adults). [79] Evidence regarding the effects of caffeine on pregnancy and for breastfeeding are inconclusive. [26]
High doses of caffeine intake during pregnancy may increase the risk of miscarriage [49] and some major negative pregnancy outcomes, such as stillbirth or low birth weight. [ 50 ] [ 51 ] A 2020 review called into question the safe levels proposed by the European Food Safety Authority, the American Congress of Obstetricians and Gynecologists ...
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While there are short-term performance benefits to caffeine consumption, overuse can lead to insomnia symptoms or worsen pre-existing insomnia. [138] Consuming caffeine to stay awake at night may lead to sleeplessness, anxiety, frequent nighttime awakenings, and overall poorer sleep quality. [139]
The researchers compared people who did not consume any caffeine or who drank less than 100 milligrams (mg) per day with people who drank about 200 to 300 mg of caffeine a day, or the equivalent ...