Here's a crazy fact: Thanks to soda and the sneaky added sugars in store-bought foods, 25% of Americans consume a diet that is 25% sugar. In fact, all it takes to hit that is three cans of soda on top of an otherwise sugar-free diet. What does eating like that mean for your health in the long term? Scientists are still trying to figure that out. Scicurious breaks down a recent study in mice that successfully demonstrates both why our sugar intake has health experts concerned AND why we don't yet know exactly what we're doing to ourselves.
This week, scientists cloned a mouse from cells found in a drop of mouse blood. That's different from other cloned mice, whose creation relied on more invasive sampling from the liver, bone marrow, and lymph nodes (read: the original animal was euthanized). Cloning mice is valuable for scientific research — it's handy to have your subjects be as alike one another as possible. Now, scientists have a way to do that without having to kill the original mouse.
"When Yi Rao of Peking University in Beijing, China, and his colleagues genetically engineered female mice so that they could no longer make or respond to serotonin, it appeared to affect their sexuality. Although they would still mate with males if no other females were present, given the choice, the rodents preferred sniffing and mounting females." [New Scientist]
A study at MIT involving mice fed a diet of vanilla yogurt with probiotics yielded interesting and unanticipated results:
First, the scientists noticed that the yogurt-eating mice were incredibly shiny. Using both traditional histology techniques and cosmetic rating scales, the researchers showed that these animals had 10 times the active follicle density of other mice, resulting in luxuriantly silky fur.
Then the researchers spotted something particular about the males: they projected their testes outward, which endowed them with a certain “mouse swagger,” Erdman says. On measuring the males, they found that the testicles of the yogurt consumers were about 5 percent heavier than those of mice fed typical diets alone and around 15 percent heavier than those of junk-eating males.
More in SciAm. The fact that these manly-mouse-man results were achieved from girly-vanilla-yogurt is not lost on me.
But I want to know is, how exactly does one go about weighing the mice's testicles? Your thoughts in the comments. (via Ed Yong)