National Geographic | Mind, Body, Wonder

This week: The agonizing condition known as frozen shoulder; how to move the right way; why BMI isn't a reliable indicator of health; why your immune system is so impressive; how to use castor oil; protecting your skin in winter.

PHOTOGRAPH BY K H FUNG, SCIENCE PHOTO LIBRARY

Frozen shoulder is a real condition—and it mostly affects women

The painful affliction known as adhesive capsulitis is a poorly understood, often agonizing, uncurable condition that can inflame and immobilize the shoulder joint for months or even years—but it has long been ignored by medical researchers who doubted its existence. These new treatments may finally promise a cure.

ESTROGEN LOSS AND JOINT PAIN

Read more on women's health:

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What happens during menopause? Science is finally piecing it together.

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Endometriosis is common, incredibly painful—and often misdiagnosed. Why?

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Does a woman's fertility really plummet at age 35?

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Is it possible to cure hot flashes? We may be getting closer.

PHOTOGRAPH BY FRITZ HOFFMANN, NAT GEO IMAGE COLLECTION

The way you move says a lot about your health. Here's how to do it right.

Lack of mobility is one of the top reasons that seniors lose independence, and it's also closely linked to cognitive decline. Experts say there are four types of exercises we should all be getting to help us stay active: endurance, strength, balance, and flexibility—and that's just the start of the equation.

THE SIXTH VITAL SIGN?

NO TIME TO EXERCISE: Just 5 minutes still has a big impact +

PHOTOGRAPH BY MANAN VATSYAYANA, AFP/GETTY IMAGES

BMI isn't a reliable indicator of your health. Here's why.

There is no evidence to support the idea that losing weight alone lowers the risk of heart disease and cancer, but other lifestyle changes can.

IT'S NOT THE FAT—IT'S WHERE IT'S AT

PHOTOGRAPH BY STEVE GSCHMEISSNER, SCIENCE SOURCE

Got a cold? Here's how your immune system is fighting it.

All day every day, a host of potential invaders attacks the body. These microorganisms, called pathogens, come in the form of viruses, bacteria, parasites, and fungi, and the body's immune system sets up multiple lines of defense to fight them. Here's how it wards off sickness in every season.

HOW IMMUNITY WORKS

HERBAL REMEDIES? These 7 herbs may help fight cold and flu +

PHOTOGRAPH BY PETE MULLER, NAT GEO IMAGE COLLECTION

Can supplements really 'boost' your immunity?

Increasing your intake of zinc and vitamins C and D during winter isn't a magic bullet. Here's what the science says about what does and doesn't work.

THE TRUTH ABOUT SUPPLEMENTS

HOW TO USE CASTOR OIL—PROPERLY

PHOTOGRAPH BY BDSPN, GETTY IMAGES

Social media influencers swear by castor oil for curing blurry vision, busting belly fat, and even killing tumors. But what does it actually do for the body? While some of these modern claims are fairly innocuous, others might put your health at risk. Here are the claims that are grounded in science.

THE WORLD'S 'OLDEST DRUG'

HOW TO PROTECT YOUR SKIN FROM THE COLD

PHOTOGRAPH BY JAMIE GRILL, GETTY IMAGES

Most people only need three things to keep their skin barrier intact—but during the winter, skin may need a bit more care. Here's a look at how our skin protects us, how to keep it intact, and what's nice (but not strictly necessary) to add to your routine.

WHAT YOUR SKIN REALLY NEEDS

READ MORE TOP STORIES FROM NAT GEO

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Inflammation diets have been trendy for a long time. But new research is revealing exactly how your diet can affect the gut microbiome—and ultimately ward off chronic disease. Here are the foods that really do reduce inflammation.

How old are you, really? The answer is written on your face.

Can fasting help you live longer? Here’s what the science says.

The Mediterranean diet has stood the test of time for a reason: It works

When you go sober for even a month, your body will change. Here's how.

The 5 'Blue Zones' where the world's healthiest people live

Not all fat is created equal. This 'good fat' could keep us youthful.

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