Five Signs That You Might Have a Protein Deficiency

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  • Source: GQ
  • 02/23/2026

Want to feel better, have more energy, stop snacking, and build mass? Protein should be your go-to. But what happens if you suffer from a protein deficiency and don’t hit enough of it? Losing muscle mass is the least of our problems: there’s much more to it than that. Ignore your protein macros and you could be risking your health and mobility as you age, among other more immediate problems.

What does protein do in our bodies?

“Think of protein as the raw materials your body uses to build nearly every part of it. If there aren’t enough materials to build with, no matter how hard it tries, your body won’t be able to create new cells or repair existing ones,” explains Harry Cox, founder of London’s Club Q Health.

This affects more than just the size of your biceps. It impacts the function of your immune system, the production of hormones and many other chemical reactions in the body. In short: protein is a big deal.

“Protein plays a vital role in nearly every function of the body,” says UK certified, award-winning dietician Fareeha Jay. “It drives most chemical reactions as the amino acids that make up proteins act as neurotransmitters, hormones, and regulators of many physiological processes.”

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