Risk of miscarry is increased substantially in excessive coffee drinkers during pregnancy, an Asian study suggested
Coffee, one of most popular and social beverage all over the world, particularly in the West, is a drink made from roasted bean from the Coffea plant, native to tropical Africa and Madagascar.
Miscarriage is the expulsion of a fetus from the womb between the 12th and 28th weeks of gestation.
In a case-controlled study conducted in Milan of 561 (72%) cases of spontaneous abortion and 877 (57%) controls,coffee drinking during the first trimester of the index pregnancy with healthy women who gave birth at term (> 37 weeks gestation) to healthy infants as control, researchers reported that the risk of miscarry is classified as follow
1. Coffee intake of 1, 2 or 3, and 4 or more cups of coffee per day, are associated to increased risk of 1.2, 1.8 and 4.0, respectively in compared to non drinkers.
2. The risk of pregnancy loss also is associated to the duration in years of coffee drinking. The estimated multivariate odds ratios of spontaneous abortion were 1.1 in comparison to non-coffee intake group.
Further more, in the evaluated effect of caffeine in influence of miscarriage researchers at the Boston University School of Public Health, conducted a prospective cohort study included 5132 Danish women planning pregnancy, enrolled from 2007 to 2010, after carefully assessed the returned beverage consumption on questionnaires, researcher found that a significantly miscarried risk is 1.62 higher in women consumed more that 300 mg/day of caffeine per day, in compared to 1.09 in women who consumes <100 mg/day. Specifically, women with daily intake of caffeine of
1. <100 mg/day showed a materially associated with SAB risk of 1.09
2. 100-199mg/day showed a materially associated with SAB risk of 0,89
3. 200-299mg/day showed a materially associated with SAB risk of 1.33
In compared to non pre-pregnancy coffee intake, risk of SAB increased by 20% for women consuming ≥4 servings/day.
More importantly, Dr. Gaskins AJ, the lead author said, "Pre-pregnancy coffee consumption at levels ≥4 servings/day is associated with increased risk of SAB, particularly at weeks 8-19".
Taking together, there is no doubt that coffee may contribute to a relative risk of miscarry for women consuming more than 4 cup per day. Women who are pregnant between 12 to 28 weeks of gestation with excessive coffee intake habit are recommended to consult with their doctors.
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Some articles have been used as references in medical research, such as international journal Pharma and Bio science, ISSN 0975-6299.
(1) Coffee consumption and risk of hospitalized miscarriage before 12 weeks of gestation by Parazzini F1, Chatenoud L, Di Cintio E, Mezzopane R, Surace M, Zanconato G, Fedele L, Benzi G.(PubMed)
(2) Caffeine and caffeinated beverage consumption and risk of spontaneous abortion by Hahn KA1, Wise LA2, Rothman KJ3, Mikkelsen EM4, Brogly SB5, Sørensen HT6, Riis AH4, Hatch EE5.(PubMed)
(3) Pre-pregnancy caffeine and caffeinated beverage intake and risk of spontaneous abortion by Gaskins AJ1,2, Rich-Edwards JW3,4,5, Williams PL3,6, Toth TL7, Missmer SA3,4,8,9, Chavarro JE10,3,4.(PubMed)