A driving force behind this is the growing effort to find a long-term replacement for opioids, an addictive painkiller that has plunged the country into an epidemic of death and addiction.

Liver cancer incidence is highest in the United Kingdom (9.6 per 100,000 people), followed by 9.2 in the United States, 7.4 in Australia and 6.0 in Canada. The rankings are the same for liver cancer deaths.

According to the CDC, 73 illnesses potentially tied to contaminated cereal have been reported across 31 states. Twenty-four people have been hospitalized, but no deaths have been reported. Illnesses have been reported from May 3 through May 28.

These findings jibe with suggestions that snacks like nacho-flavored chips are foods perfectly engineered to push your buttons, containing "the right combo of fat, carb and salt," said Dr. Mitchell Roslin, chief of obesity surgery at Lenox Hill Hospital in New York City.

Between 2007 and 2017, the percentage of high school students who said they had ever had sex fell from 48 percent to 39.5 percent, and the percentage who said they'd had four or more sexual partners decreased from 15 percent to just under 10 percent.