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Thanks to glands of the endocrine system like the ovaries, testes, thyroid and hypothalamus, special chemical messengers known as hormones influence the health of our minds and bodies every day — whether it’s basic needs like hunger and movement to more complex systems such as puberty and reproduction. Hormones can also influence our emotions and moods.

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As cliché as it may sound, it’s also a fact: Doing good is good for everyone. Altruism is beneficial to your mental health, physical well-being and sense of belonging. A recent study revealed that volunteering for as little as two hours every week can be instrumental to your health. The same study found that out of all the do-gooders who spent their free time helping others 93 percent reported an improved mood, 79 percent reported decreased stress levels and 88 percent felt a boost in their self-esteem.

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Experts say there's an "epidemic" of vaping among middle and high school students, and nothing seems to be stopping it. Now, some schools are looking for help from an untapped resource: their own students. CNN's Chief Medical Correspondent Dr. Sanjay Gupta has the story.

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After eating all those extra calories this holiday season, hitting the gym might not be the best way to pursue your weight loss goal. CNN's Dr. Sanjay Gupta explains.

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No one helped Mary Robinson mourn the death of her father when she was 14. Today, she is making sure kids suffering a similar loss have the tools and support they need.

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With so many types of water on the market, knowing which to buy can be difficult. CNN Health writer Jacqueline Howard helps breakdown the labels.

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