Allison Aubrey

There's a lot of enthusiasm for intermittent fasting — a term that can encompass everything from skipping a meal each day to fasting a few days a week.

This story was produced as part of a collaboration with the PBS NewsHour

As the season of big holiday meals kicks off, it's as good a time as any to reflect on just how much food goes to waste.

If you piled up all the food that's not eaten over the course of a year in the U.S., it would be enough to fill a skyscraper in Chicago about 44 times, according to an estimate from the U.S. Department of Agriculture.

It's long been known that eating fish — especially cold-water fish such as salmon that are rich in omega-3 fatty acids — is good for heart health.

But, for the millions of Americans who are at high risk of heart disease, eating enough fish to make a difference isn't likely to be realistic for most.

There's new evidence that mind-body interventions can help reduce pain in people who have been taking prescription opioids — and lead to reductions in the drug's dose.

In a study published this month in JAMA Internal Medicine, researchers reviewed evidence from 60 studies that included about 6,400 participants. They evaluated a range of strategies, including meditation, guided imagery, hypnosis and cognitive behavioral therapy.

Officials at the Centers for Disease Control and Prevention say there has been a breakthrough in the investigation into the outbreak of vaping-related lung injuries that has led to the deaths of 39 people and sickened more than 2,000 others.

Investigators announced Friday that they have detected a chemical compound called vitamin E acetate in all the samples of lung fluid collected from 29 patients who were hospitalized after vaping, suggesting a possible culprit for the spate of lung injuries that has swept across the U.S.

E-cigarette maker Juul Labs announced Thursday it will suspend sales of most of its flavored products, including mango, fruit and cucumber. These types of flavors are considered an on-ramp to vaping for teenagers.

The move comes as the industry faces immense scrutiny. Several states have instituted bans on flavored products, and the Trump administration has signaled that a federal ban may be in the works.

There's fresh evidence that eating a healthy diet, one that includes plenty of fruits and vegetables and limits highly processed foods, can help reduce symptoms of depression.

Piper Johnson was all packed and ready to drive across country with her mom to start college when the 18-year-old noticed a pain in her chest. She took an Advil and hoped the pain would go away.

It didn't. During the drive from her hometown of New Lenox, Ill., near Chicago, to the University of Northern Colorado in Greeley, Colo., she realized something was very wrong. "I kept feeling worse and worse," Johnson says. She developed a high fever, felt extremely lethargic, and noticed a rapid heart beat.

The condition strikes young children. It can start with run-of-the-mill virus symptoms, like fever or sniffles. But, then the kids lose control of their limbs, may have trouble swallowing or breathing, or even end up paralyzed. This terrifying experience happened to more than 570 families since 2014, whose children were struck with an illness called acute flaccid myelitis, or AFM.

The Centers for Disease Control and Prevention intensified its warnings about the risks of vaping, as the number of patients with vaping-related illness continues to climb.

The case count has reached 1,080, the agency announced Thursday. There have been 18 deaths in 15 states, and more deaths are being investigated. All patients reported a history of vaping, and the majority reported using THC-containing products.

A new set of analyses published Monday in the Annals of Internal Medicine challenges the widespread recommendations to cut back on red and processed meats.

The mystery of the outbreak of vaping-related lung illnesses is still not solved.

But investigators in Illinois and Wisconsin have found some clues, they announced Friday in a press briefing.

Investigators in these two states conducted detailed interviews with 86 patients — mostly young men — and 66% said they had vaped THC products labeled as Dank Vapes. THC is the psychoactive ingredient in cannabis.

What are Dank Vapes and how could they be fueling the outbreak?

Nationwide, people who vape continue to sicken with severe and unexplained lung illness, leaving doctors and patients concerned about both the acute and long-term effects of the injuries.

The Centers for Disease Control and Prevention announced Thursday that there are now 530 confirmed or probable cases of lung injury associated with vaping, a jump from 380 cases reported last week. Seven people have died.

A 14-year-old boy goes to the doctor with complaints of tiredness. He's an extremely picky eater. (Think a daily diet of French fries, plus snacking on Pringles potato chips, white bread and some processed pork.) But overall, he appears OK. He's not overweight and takes no medications.

Tests show he has anemia and low levels of vitamin B12, so he's given B12 injections and diet advice. But a year later, he has begun to lose his vision. Then, by age 17, he's legally blind.

The shooter who opened fire after a routine traffic stop Saturday in Texas, killing seven people and injuring 22, was fired just hours before the deadly shooting.

Seth Aaron Ator, 36, who lived in the Odessa area, had been fired from his job at Journey Oilfield Services after a disagreement, according to Odessa Police Chief Michael Gerke. The shooting rampage, which appears to have been random, ended when Ator was killed by police.

At a time when more than 30 states and the District of Columbia have legalized the use of marijuana for either medical or recreational use, the U.S. surgeon general says no amount of the drug is safe for teens, young adults and pregnant women.

Packing a turkey sandwich in your kid's lunchbox, or serving up bacon or hot dogs?

When shopping for processed meats, many health-conscious consumers look for products with words like "no nitrates added" or "uncured" on the packaging. But we may have been misled, experts say.

A new report finds that deli meats with those labels actually contain similar levels of nitrates as meats that don't carry these labels.

Virtual reality is not new. But, as people search for alternative ways to manage pain — and reduce reliance on pills — VR is attracting renewed attention.

Imagine, for a moment you've been transported to a sunlit lagoon. And, suddenly, it's as if you're immersed in the warm water and swimming. That's what Tom Norris experiences when he straps on his VR headset.

Emphysema is considered a smoker's disease. But it turns out, exposure to air pollution may lead to the same changes in the lung that give rise to emphysema.

Could it happen here? It's a question a lot of people ask in the wake of a traumatic event.

Even if you're not directly connected to the events in El Paso, Gilroy or Dayton, chances are you've felt the weight of them.

Humans must drastically alter food production to prevent the most catastrophic effects of global warming, according to a new report from the United Nations panel on climate change.

The panel of scientists looked at the climate change effects of agriculture, deforestation and other land use, such as harvesting peat and managing grasslands and wetlands. Together, those activities generate about a third of human greenhouse gas emissions, including more than 40% of methane.

Allergan has announced a global recall of textured breast implants that are linked to a rare type of cancer, at the request of the Food and Drug Administration.

"Biocell saline-filled and silicone-filled textured breast implants and tissue expanders will no longer be distributed or sold in any market where they are currently available," according to a company statement Wednesday.

Sun exposure is the leading risk factor for developing melanoma. And there's evidence that alcohol consumption is linked to an increased risk of skin cancer, too.

Part of the explanation is that when people drink, they tend to be more lackadaisical: They're less likely to apply sunscreen and more likely to spend too much time in the sun, be it at the beach or pool. But this isn't the whole story.

When Athletic Brewing Co. offered its nonalcoholic limited-edition Double Hop IPA for sale online last week, it sold out in 32 seconds.

"We've actually been totally overwhelmed and shocked by how strong the nationwide online demand is," says Bill Shufelt, co-founder of Athletic Brewing Co., which produces only nonalcoholic brews.

A new study published in The BMJ can't tell you exactly how much red meat is OK to eat to maintain good health or prevent disease.

But it does help sort out a big-picture, and perhaps more important, question: What does a healthy pattern of eating look like?

The U.S. Preventive Services Task Force has a new recommendation aimed at preventing HIV infections and AIDS. The influential panel's guidance says people at high risk of being infected with HIV should be offered preventive antiretroviral medications — taken in a daily pill.

There's lots of evidence that preexposure prophylaxis — also known as PrEP — is effective. The Food and Drug Administration-approved pill Truvada contains two antiretroviral medicines (tenofovir and emtricitabine).

The Food and Drug Administration is holding its first public hearing on CBD, the cannabis extract that has quickly grown into a billion-dollar industry. Today's hearing will help officials determine how to regulate CBD products.

The compound can be extracted from marijuana or from hemp. It's promoted as a way to ease anxiety and inflammation – and it doesn't get people high because it doesn't contain THC, the psychoactive component of the cannabis plant.

There's nothing magical about the number 10,000.

In fact, the idea of walking at least 10,000 steps a day for health goes back decades to a marketing campaign launched in Japan to promote a pedometer. And, in subsequent years, it was adopted in the U.S. as a goal to promote good health. It's often the default setting on fitness trackers, but what's it really based on?

"The original basis of the number was not scientifically determined," says researcher I-Min Lee of Brigham and Women's Hospital.

The Food and Drug Administration sent a letter to the food industry on Thursday, urging companies to get behind the initiative to standardize the use of the phrase "best if used by" on packaged food labels.