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If your hair is shedding, thinning or breaking more easily lately, the problem could be hiding in your diet.

Protein has gone mainstream, showing up in everything from popcorn to pancake mix to coffee creamer as people seek it to lose weight and build muscle. But it's also one of the most important nutrients for healthy locks, according to experts.

Hair is primarily made of keratin, a protein built from amino acids, and without enough of it, strands can quickly lose strength and density.

NEW 'CLEAR PROTEIN' HACK MUSCLES IN AS LATEST TREND IN THE BATTLE OF THE BULGE

"As a hair surgeon, I see protein deficiency show up as diffuse shedding and weaker, more brittle strands," said Dr. Ross Kopelman, a hair transplant surg

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