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One 12-ounce cup (355 ml) of brewed coffee contains about 200 mg of caffeine, but tea generally contains less caffeine and the amount can vary by type of tea and how long it was brewed.
Consumption of caffeine is not associated with adverse reproductive and developmental effects. [79] The half-life of caffeine is longer in pregnancy by 8 to 16 more hours, which means that caffeine stays in the person longer, increases fetal exposure to caffeine, and is eliminated slower in the body. [78]
The health effects of coffee include various possible health benefits and health risks. [ 1 ] A 2017 umbrella review of meta-analyses found that drinking coffee is generally safe within usual levels of intake and is more likely to improve health outcomes than to cause harm at doses of 3 or 4 cups of coffee daily.
The harmful effects of caffeine during pregnancy can be attributed to its ability to absorb rapidly into the bloodstream and cross into the placenta, along with the slowed breakdown of caffeine that occurs during pregnancy which can expose the fetus to caffeine and its metabolites for a prolonged period of time.
But according to Yawitz, “having too much can lead to anxiety, insomnia, diarrhea, jitters, a rapid heart rate, and other unpleasant side effects.” And, in very extreme cases, death. Mike Kemp ...
There have been many studies examining the potential positive and negative effects of caffeine on a person’s health. Much previous research has focused on how caffeine might impact heart health.
The fetus and infant are especially vulnerable to mercury exposures with special interest in the development of the CNS since it can easily cross across the placental barrier, accumulate within the placenta and fetus as the fetus cannot eliminate mercury and have a negative effect on the fetus even if the mother does not show symptoms. [16]
Evidence regarding the effects of caffeine on pregnancy and for breastfeeding are inconclusive. [26] There is limited primary and secondary advice for, or against, caffeine use during pregnancy and its effects on the fetus or newborn. [26]