Among women who consumed no caffeine, the miscarriage rate was 12.5 percent.
The drivers who consumed caffeine to keep them from nodding off behind the wheel were 63% less likely to crash than drivers who had no caffeine.
The FDA regulates caffeine in sodas at a level of .02%, or 200 parts per million (there is no current FDA caffeine limit for energy drinks).
But there was no explanation as to why men fared no better after their caffeine fix.
Researchers say it made no difference whether the caffeine came from coffee, soda, tea or hot chocolate.
Road safety experts stressed caffeine was no substitute for sleep.
"There's no known source of caffeine in temperate zones, so there's nothing we can suggest as a sort of alternative hypothesis at this point except for a human source, " she said.
The Osmond family was the Mormon family: too many kids and too many teeth, maybe, but always solid, always smiling, always temperate no alcohol, no tobacco, not even caffeine.
This northern Italian city has no shortage of cafes where you can soak up the atmosphere and fuel up on caffeine, but one of the most popular and authentic is Gilli in the Piazza della Repubblica, where you can sip your coffee underneath chandeliers and frescoes.
He also noted that Monster's labels say people should drink no more than three 16-ounce cans a day, which is nearly five times the maximum daily caffeine limit recommended for children by the Food and Drug Administration.
Even when DMAA and caffeine were combined in one study and the subjects went on a 10km run, the researchers found no increase in heart rate during the run, compared to the runners given a placebo.
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