The conclusion follows a comprehensive review of records of the frequencies of dental cavities in both prehistoric and living human populations from research done around the world. A driving factor was dramatic changes in female-specific hormones, reports John R. Lukacs, a professor of anthropology who specializes in dental, skeletal and nutritional issues.
His conclusions are outlined in the October issue of Current Anthropology. The study examined the frequency of dental caries (cavities) by sex to show that women typically experience poorer dental health than men. Among research reviewed were studies previously done by Lukacs. Two clinical dental studies published this year (one done in the Philippines, the other in Guatemala) and cited in the paper, Lukacs said, point to the same conclusions and "may provide the mechanism through which the biological differences are mediated."
A change in food production by agrarian societies has been associated with an increase in cavities. Anthropologists have attributed men-women differences to behavioral factors, including a sexual division of labor and dietary preferences. However, Lukacs said, clinical and epidemiological literature from varied ecological and cultural settings reveals a clear picture of the impacts on women's oral health.
"The role of female-specific factors has been denied by anthropologists, yet they attain considerable importance in the model proposed here, because the adoption of agriculture is associated with increased sedentism and fertility," Lukacs said. "I argue that the rise of agriculture increased demands on women’s reproductive systems, contributing to an increase in fertility that intensified the negative impact of dietary change on women’s oral health. The combined impacts of increased fertility, dietary changes and division of labor during the move into agricultural societies contributed to the widespread gender differential observed in dental caries rates today."
Lukacs' meta-analysis looked at both prehistoric anthropological and modern health records. He repeatedly found that increases in cavities go in favor of women in adulthood. Lukacs' review found that women’s higher rates of cavities are influenced by three main changes:
• Female sex hormones. Citing his own research published in 2006, he notes that these hormones and associated physiological factors can significantly impact cavity formation. A study on animals published in 1954 found that female estrogens, but not male androgens, were correlated to cavity rates. He argues for a cumulative effect of estrogens, including fluctuations at puberty and high levels during pregnancy that both promote cavities and dietary changes.
• The biochemical composition and flow rate of saliva. Women produce less saliva than do men, reducing the removal of food residue from the teeth, and that during pregnancies the chemical composition changes, reducing saliva's antimicrobial capacity.
• Food cravings, immune response and aversions during pregnancy. Lukacs points to findings that women crave high-energy, sweet foods during the third trimester, as well as an aversion to meat in first trimesters.
How the factors combine to contribute to higher risk of cavities in women as they age is not fully documented or understood, he wrote. "However, if hormonal and physiological factors work in an independent or additive manner, their impact on women's oral health could be significant. The fact that women's caries experience increases with age at a greater rate than men's in diverse ethnic groups from different ecological and cultural settings supports this interpretation."
The Alexander von Humboldt Foundation, American Institute of Indian Studies, American Philosophical Society, L.S.B. Leakey Foundation, National Geographic Society, National Science Foundation and Wenner-Gren Foundation for Anthropological Research supported the project.About the University of Oregon
Source: John R. Lukacs, professor of anthropology, College of Arts and Sciences, 541-346-5112, firstname.lastname@example.org
Links: Lukacs faculty page: http://darkwing.uoregon.edu/~jrlukacs/Dr.%20John%20R.%20Lukacs%20Website/index.html; department of anthropology: http://www.uoregon.edu/~anthro/; College of Arts and Sciences: http://cas.uoregon.edu
Jim Barlow | Newswise Science News
ASU scientists develop new, rapid pipeline for antimicrobials
14.12.2017 | Arizona State University
A whole-body approach to understanding chemosensory cells
13.12.2017 | Tokyo Institute of Technology
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
13.12.2017 | Health and Medicine
13.12.2017 | Physics and Astronomy
13.12.2017 | Life Sciences