Katherine Hobson

It's flu season — time for the marketing of juices and supplements that claim to boost immunity. But they don't help, scientists say. Instead, try eating healthy and getting enough sleep.

Interval training is a hot thing. Alternating bouts of relatively intense exercise with recovery can provide some benefits of longer workouts in less time. But you still have to put in the work.

Many anti-obesity programs focus on children's diet and behavior during the school year. This study is the latest of many to find that they gain weight faster over summer vacation.

Most research on placebos involves people who think they're getting an active treatment, but aren't. But they may also work when people know full well they're getting a sham treatment.

The American Academy of Pediatrics has launched more liberal guidelines on children's media use. They're offering parents an online tool to help manage the what, where and when of family screen time.

Many women have dense breasts, and they may benefit from other forms of cancer screening beyond mammograms. But none of the options is ideal, and the available data don't make the decision easier.

People in their 70s and 80s recovered more quickly from physical setbacks if they remained active, a study finds. Walking a total of 150 minutes a week with some strength training did the trick.

You can nudge your kids' relationship with digital technology in a more healthful direction, but warning: It's going to require parents to change, too.

A review of studies on the effects of using marijuana while pregnant found no harms to newborns. But other studies have found an increased risk of thinking problems and ADHD in older children.

Fentanyl is showing up in heroin and counterfeit pain pills, and users may not even know they're taking the extremely potent drug.

Contact lenses seem safe and easy, but a CDC analysis shows people can get serious eye infections from them. The usual culprits: wearing them too long and failing to be meticulous about cleaning.

The link isn't definite, but it matches other research that suggests that difficult experiences in childhood affect physical health years down the line. Just how that happens remains a mystery.

One athlete's "psych-up" ritual may psych out an opponent. And even treatments that lack hard evidence of benefit, scientists say, might provide a competitive edge if the athletes believe they work.

The government recommends that adults engage in two sessions a week of resistance training to maintain muscle and prevent injury. Most of us aren't getting close to that, but it's easy to catch up.

Injuries at the indoor parks are still dwarfed by injuries on home trampolines. But researchers warn that the parks seem to result in more serious injuries that can require admission to the hospital.

Some tests that used to be part of an annual physical are no longer recommended. Others can be done less often. Still, seeing your doctor regularly for a face-to-face chat may help your health.

A big study suggests that radiologists vary widely in their assessment of density, a risk factor for breast cancer. And density is just one component of breast cancer risk, the researchers underscore.

Good intentions are great, but they'll only take you so far. There are some research-backed techniques you can use to increase your odds of following through on living better, however.

A survey of parks in 25 major cities find that they're used mostly by young children and teenage boys. Walking loops and other options that would appeal to women are in short supply.

Some supplements sold to improve workouts contain a stimulant that's been banned and may pose health risks, according to tests. The Food and Drug Administration has warned seven manufacturers.