Video
Shop
Culture
Family
Wellness
Food
Living
Style

Travel
News
Book Club

Newsletter

Privacy Policy
Your US State Privacy Rights
Children's Online Privacy Policy
Interest-Based Ads
Terms of Use
Do Not Sell My Info
Contact Us
© 2026 ABC News

NaN:NaN

ABC News
June 21, 2012

AC

Study of rats shows cycle of hormones mobilizes body's immune system.

Up Next in news

Chronic Stress Feeds Common Cold

Chronic Stress Feeds Common Cold

Hormone Effect: Why Christmas Makes Us Nutty

Hormone Effect: Why Christmas Makes Us Nutty

December 7, 2011

Can Parents Die of Broken Hearts?

Can Parents Die of Broken Hearts?

September 7, 2011

The latest lifestyle and entertainment news and inspiration for how to live your best life - all from Good Morning America.

Contests
Terms of Use
Privacy Policy
Do Not Sell My Info
Children’s Online Privacy Policy
Advertise with us

Your US State Privacy Rights
Interest-Based Ads
About Nielsen Measurement
Press
Feedback

Shop FAQs
ABC News
ABC
All Videos
All Topics

Sitemap

© 2026 ABC News

Privacy Policy—
Your US State Privacy Rights—
Children's Online Privacy Policy—
Interest-Based Ads—
Terms of Use—
Do Not Sell My Info—
Contact Us—

© 2026 ABC News