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“Energy drinks contain varying amounts of caffeine, so check nutrition labels to understand how much caffeine and other ingredients they contain,” Dr. David Nelson said in a news release from University of Texas (UT) Southwestern Medical Center in Dallas. He's division chief of maternal-fetal medicine.
The caffeine content of energy drinks can range from 50 mg to 500 mg in 8-ounce to 24-ounce cans and bottles, Nelson noted.
During pregnancy or while attempting to become pregnant, U.S. guidelines recommend that women consume less than 200 milligrams of caffeine per day. That level does not appear to be associated with miscarriage or preterm birth, according to the American College of Obstetricians and Gynecologists. However, the relationship between caffeine consumption and fetal-growth restriction remains uncertain.
A full-strength, 8-ounce cup of coffee contains just under 100 mg of caffeine. A 12-ounce Coke has about 34 mg of caffeine. Diet Coke has 46 mg of caffeine. A regular Mountain Dew has 54 mg. The small, 2-fluid-ounce energy shots have about 200 mg of caffeine.
U.S. regulations on content labeling and health warnings for energy drinks are among the most lax, according to UT Southwestern. The U.S. Food and Drug Administration doesn't regulate energy drinks.
The impact of caffeine on adverse pregnancy outcomes is a controversial topic, according to the latest edition of Williams Obstetrics, an obstetrics guide. High consumption of about 500 mg daily slightly raises the risk of miscarriage. Studies on less than 200 milligrams daily have not identified higher risk. Another recent study, of patients from 10 states, found that pre-pregnancy or first-trimester daily caffeine consumption was not strongly linked to birth defects.
“Gradual reduction in caffeine intake over several weeks before planning pregnancy, or when you find out you are pregnant, can help prevent caffeine withdrawal,” he said.
Nelson suggested some caffeine-free ways to boost energy. They include exercising regularly, eating healthy foods, drinking plenty of water, relaxing or taking naps, and following a regular sleep schedule.
The Office on Women's Health has more healthy pregnancy suggestions.
SOURCE: UT Southwestern Medical Center, news release, July 17, 2023
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