Alexandra Sifferlin

A new study of cyclists found that exercise is linked to a healthier immune system. 
By Alexandra Sifferlin
A new study of the best available scientific evidence suggests there's no link between the two.
By Alexandra Sifferlin
*(You're still going to die, though.)
By Jeffrey Kluger, Alexandra Sifferlin
People who lose a partner are at risk for heart problems for up to a year, a new large study shows
By Alexandra Sifferlin
Do you believe these things?
By Alexandra Sifferlin
The answer is more complicated than you think. 
By Alexandra Sifferlin
It's probably not what you think. 
By Alexandra Sifferlin
It's time to get moving. 
By Alexandra Sifferlin
Most Americans want to lose weight, but it’s no simple feat. Just ask someone who’s done it.
By Alexandra Sifferlin
There’s no such thing as one perfect diet
By Alexandra Sifferlin
A new study suggests there’s a downside to all that protein.
By Alexandra Sifferlin
Here’s the lowdown on how to turn your home into an anti-mosquito fortress.
By Alexandra Sifferlin
New research adds urgency to the need for relief.
By Alexandra Sifferlin
Here’s what U.S. News calls the best diet plans for 2018. 
By Alexandra Sifferlin