Q: Does coffee increase my risk of having a miscarriage?

A: Caffeine may increase your risk of having a miscarriage. A study published in January 2008 concludes that an intake of 200 milligrams or more per day, representing two or more cups, "significantly increases the risk of miscarriage." Currently available evidence suggests that it may be prudent for pregnant women to limit coffee consumption to 2 cups/day (no more than 200 mg/day of caffeine) to exclude any increased probability of spontaneous abortion or impaired fetal growth.   

Another recent study also found a link between coffee intake during pregnancy and miscarriage. It appears that the more coffee you drink during the early stages of pregnancy, the higher your risk of suffering from a miscarriage becomes.

Danish researchers from the University of Aarhus polled over 88,000 women to find out about coffee intake during pregnancy. The majority of these women consumed no coffee during pregnancy, however, those that did reported increased risks of miscarriage. Women who consume more than eight cups of coffee a day appear to be at the highest risk, illustrating a 59% increase in the rate of miscarriage. Researchers are still unsure why coffee appears to affect the risk of miscarriage.

  1. Massimo Giannelli, Pat Doyle, Eve Roman, Margo Pelerin, Carol Hermon (2003)
    The effect of caffeine consumption and nausea on the risk of miscarriage
    Paediatric and Perinatal Epidemiology 17 (4), 316–323.
    doi:10.1046/j.1365-3016.2003.00523.
  2. Bech BH, Nohr EA, Vaeth M, Henriksen TB, Olsen J. Coffee and fetal death: a cohort study with prospective data. Am J Epidemiol 2005;162:983–90.
  3. Signorello LB, McLaughlin JK. Maternal caffeine consumption and spontaneous abortion: a review of the epidemiologic evidence. Epidemiology 2004;15:229–39.
  4. Fenster L, Hubbard AE, Swan SH, Windham GC, Waller K, Hiatt RA, et al. Caffeinated beverages, decaffeinated coffee and spontaneous abortion. Epidemiology 1997;8:515–23.
  5. Wen W, Shu XO, Jacobs DR, Brown JE. The associations of maternal caffeine consumption and nausea with spontaneous abortion. Epidemiology 2001;12:38–42.