Nonalcoholic fatty liver disease, a condition closely linked to obesity, affects roughly 25 percent of people in the U.S. There is no drug treatment for the disease, although weight loss can reduce the buildup of fat in the liver.

Now, studying mice, new research shows that a natural sugar called trehalose prevents the sugar fructose -- thought to be a major contributor to nonalcoholic fatty liver disease -- from entering the liver and triggers a cellular housekeeping process that cleans up excess fat buildup inside liver cells.

The research, by a team at Washington University School of Medicine in St. Louis, appears Feb. 23 in the journal Science Signaling.

A new study of a protein found in cilia - the hair-like projections on the cell surface - may help explain how genetic defects in cilia play a role in developmental abnormalities, kidney disease and a number of other disorders.

The researchers at Princeton University and Northwestern University found that the protein, which goes by the name C21orf59 or "Kurly," is needed for cilia to undulate to keep fluid moving over the surface of cells. They also found that the protein is needed during development to properly orient the cilia so that they are facing the right direction to move the fluid.

The Louisiana Scholarship Program has widely varying effects on students, according to a series of studies released jointly by the School Choice Demonstration Project at the University of Arkansas and the Education Research Alliance for New Orleans at Tulane University.

The studies address the effects of the Louisiana voucher program on the achievement and non-cognitive skills of voucher recipients, as well as broader effects on school segregation and public school students. It is the first evaluation to examine such a wide range of outcomes, or to consider the effects over the first two years of this specific program. Key findings include:

For the first time experts have been able to eliminate external factors and specifically pinpoint television as having a direct link with female body ideals.

It is known that the perception of a woman's perfect body shape is influenced by images of celebrities and models seen in the media.

However, in the past, there has been little attempt to control variables in order to isolate the effects of media exposure from other cultural and ecological factors.

Scientists examined preferences for body size in relation to television consumption of men and women in Nicaragua, Central America. Findings are published in the British Journal of Psychology.

Use of positron emission tomography (PET) showed no association with two-year survival in lung and esophageal cancer patients and may possibly be overused in the hopes of detecting cancer recurrence, according to a study published February 22 in the JNCI: Journal of the National Cancer Institute.

PET scans, which are primarily used in cancer patients for staging, restaging, and monitoring patients' response, are also frequently used to detect recurrence in asymptomatic patients. Despite this frequent secondary use, there has been little evidence showing that PET scans improve survival.

CHAMPAIGN, Ill. -- Images of disease and suffering should move smokers to kick the habit - at least, that's the thinking behind graphic warning labels used on cigarette packages in much of the world, and maybe someday in the U.S.

According to a University of Illinois study, however, "the good intentions of this tobacco control measure may be for naught."