“We found moderate to vigorous physical activity actually benefits women psychologically and that, in turn, helps their memory,” said the study’s lead author, Siobhan Phillips. She is assistant professor of preventive medicine at Northwestern University Feinberg School of Medicine in Chicago.

“There is a gap in consumer knowledge on sunscreen,” Shuai Xu, co-author and a resident in dermatology at the Northwestern University Feinberg School of Medicine, told TODAY.

Researchers at Northwestern University found that about 40 percent of the most popular sunscreens on the website do not meet the American Academy of Dermatology’s quality guidelines, including water or sweat resistance. Their study, published Wednesday in JAMA Dermatology, also suggested consumers spend an estimated 3,000 percent more on products than necessary.

Dermatologists “are often asked to recommend sunscreens, and we wanted to know what consumers prefer,” said lead study author Dr. Steve Xu. “This way, we are suggesting popular products they will actually use that will protect them.”

“The results were surprising in some ways,” said study author Dr. Steve Xu, a resident in the department of dermatology at the McGaw Medical Center of Northwestern University, in Chicago.

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“But, there are some important caveats,” he added. “The definition of a ‘sunscreen’ has broadened a lot. Sunscreens are no longer just bright blue bottles thrown in beach bags,” he noted, with less-protective moisturizers now often substituting for more sunscreen-specific products.

Researchers from multiple institutions, including Northwestern University Feinberg School of Medicine in Chicago, looked at the top-rated one percent of sunscreens on Amazon to see whether people are picking the sunscreens that provide the best protection. Researchers picked the sunscreens that had both the highest ratings and highest number of reviews by consumers on Amazon.

Along with normalizing bowel movements, fiber-heavy foods can be helpful in weight loss. Foods with lots of fiber tends to have fewer calories for the same volume of food. That’s key for maintaining a healthy body-mass index and diet, said Linda Van Horn, a nutrition professor at Northwestern University’s medical school. “You feel fuller when you’ve consumed those kinds of food,” Van Horn said. “That’s why any high-fiber whole grain provides this sense of fullness that helps you to reduce your total intake of calories.”