Health

by Alexandra Sifferlin

by Charlotte Alter

by Jack Linshi

by Justin Worland

by Health.com /Amanda MacMillan

by Justin Worland

by Justin Worland

by TIME Video

by Alexandra Sifferlin

by Tessa Berenson Rogers

by Justin Worland

by Melissa Hellmann

by Eric Barker

by Eliana Dockterman

by Michael Lester and Jeffrey Kluger