![Happy Pregnant Woman Images - Free Download on Freepik](https://img.freepik.com/free-photo/portrait-happy-pregnant-woman-touching-her-belly_171337-7024.jpg)
Having a baby is energetically much more expensive than commonly thought, according to new research.
In fact, over the course of a pregnancy, creating and carrying a little one takes 49,753 dietary calories — the equivalent of 199 Snickers candy bars each containing 250 calories, said Dr. Dustin Marshall, a coauthor of the study published May 16 in the journal Science.
For the meta-analysis, Marshall, a professor of evolutionary biology at Monash University in Melbourne, Australia, and a team of researchers used data from thousands of existing scientific articles to look at the energy cost of several species.
“We found that the total energy it takes to reproduce is much more substantial than previously considered.”
The bulk of the additional energy a pregnant person needs goes toward developing and carrying the fetus, Ginther added.
“Most of (the) energy that mammals put into reproduction is ‘boiled off’ as metabolic heat, only 10% ends up in the actual baby,” Marshall said in an email. “When both lactation and metabolic loads are accounted for, the baby itself represents less than 1/20th of the total reproductive investment.”
The research could make a big difference in perceptions of pregnancy needs, said Dr. Eve Feinberg, associate professor of obstetrics and gynecology at Northwestern University’s Feinberg School of Medicine in Chicago. She was not involved in the research.
“I think this study is groundbreaking,” she said. “Any working pregnant woman could tell you the sheer level of exhaustion when you are pregnant … and how it consumes your life.”