March 26, 2013 |
The mix of microbes living in the human gut -- in particular, the presence of a particular bacterium that gobbles hydrogen and produces methane -- may be related to obesity, researchers at Cedars-Sinai Medical Center in Los Angeles said Tuesday. In a study led by Dr. Ruchi Mathur, head of the Diabetes Outpatient Treatment and Education Center in the hospital's endocrinology division, researchers at Cedars-Sinai recruited 792 people of varying ages, body mass index levels and body fat content and asked them to breathe into a device that analyzed the contents of their breath.
December 19, 2012 |
People who want to lose weight are better off running than lifting weights -- or even than doing both, researchers at Duke University say. The researchers compared people who did aerobic exercise -- running, swimming, walking, for instance -- with those who did resistance training such as weightlifting and with people who did both kinds of exercise. Those who got up and moved burned the most fat, they said in the Dec. 15 Journal of Applied Physiology. “Given that approximately two-thirds of adults in the United States are overweight due to excess body fat, we want to offer clear, evidence-based exercise recommendations that will truly help people lose weight and body fat,” Leslie H. Willis, an exercise physiologist at Duke Medicine and the study's lead author, said in a statement.
October 23, 2012 |
Here's something for raw-food aficionados to chew on: Cooked food might be a big reason humans were able to grow such large brains compared to their body size, scientists say. If modern human ancestors had eaten only raw food, they'd have to regularly feed more than nine hours a day, according to a study published online Monday in Proceedings of the National Academy of Sciences. A pair of researchers from the Instituto Nacional de Neurociéncia Translacional in São Paulo, Brazil, decided to try and help explain why modern humans' brains were able to grow so large compared to their body size and why other primates' brains did not. They looked at the relative brain-to-neuron-counts of a host of primates, from owl monkeys to baboons.
September 17, 2012 |
Experts have some new weight-loss advice that's sure to be welcome news: Sleep can be just as important to a successful diet as healthful eating and exercise. “Chronic sleep restriction is pervasive in modern societies, and there is robust evidence supporting the role of reduced sleep as contributing to the current obesity epidemic,” write a pair of obesity experts in the new edition of the Canadian Medical Assn. Journal . That evidence includes findings that overtired brains prompt people to eat more, and that some hormones that regulate appetite and metabolism don't work properly in people who don't get enough sleep.
June 14, 2012 |
There has been lots of excitement this week as a horde of scientists released their first looks at the trillions of microbes that live in (or on) our bodies. As well as the two main papers published in Nature, a slate of reports was published in other journals, containing all kinds of tidbits. One week earlier, another slate of “microbiome” papers was published in the journal Science. We already covered the nuts and bolts of the Human Micriobiome Project report.
May 7, 2012 |
Dinosaurs' gassy guts may have contributed to global warming tens of millions of years ago, according to a new study that finds a group of plant-eating dinosaurs could have produced about as much methane as all of today's natural and man-made sources of the greenhouse gas. British researchers reported in Tuesday's edition of the journal Current Biology that the methane emissions from sauropods far outstripped those of today's cattle, goats and...