Coffee and Pregnancy: A Bad Mix?
Can I Have My Morning Cup o' Joe While Pregnant? By Amos Grunebaum, MD
Aug. 6, 2001 -- Caffeine's effect on pregnancy is one of the most researched of all health subjects. Most studies have shown that it's safe to drink coffee during pregnancy as long as you're consuming less than three cups, or the equivalent of 300 milligrams of caffeine, a day.
But a cup is not always a cup -- 8 ounces -- and you may actually be consuming much more than the typical 150 mg of caffeine per serving.
In preparation for writing this column, I went to my kitchen and took out several cups that are used in our household for drinking coffee. I filled the cups to about one inch below the top and measured the amount of fluid in each one. To my surprise, an average cup actually held 12 ounces, or 1-1/2 cups of fluid, and the larger ones contained 16 ounces.
So one cup of coffee could pack in more than 300 mg of caffeine, depending on its size and how it's brewed. A tall single "grande," for example, could easily contain more than the recommended maximum of 300 mg a day.
And, of course, caffeine is also an ingredient in many other beverages, such as colas, cocoa, and chocolate milk. Check out this comparison of the caffeine content in different kinds of drinks to see what you might be getting in an average day.
As far as its effect on pregnancy, several studies in humans have associated caffeine use of more than 300 mg per day with a decrease in fertility and an increase in the rate of miscarriage or low birth-weight babies. Most doctors therefore recommend that you not drink more than one to two cups of coffee a day when you're pregnant or trying to get pregnant.
Many doctors take that a step further and recommend that pregnant women and women considering pregnancy eliminate caffeine from their diets. If you're concerned, your best bet is to stop consuming caffeine entirely while trying to conceive or during pregnancy. But if you really need your daily fix, one or two regular cups of coffee are OK -- as long as you measure your cups correctly and keep your total caffeine consumption at 300 mg or less per day.