Is Too Much Protein Bad for You? Myths vs Facts

Every few years a headline warns that protein is secretly harming you. Let's separate the myths from the sensible cautions.

Myth: protein destroys healthy kidneys

This is the big one. In people with healthy kidneys, higher-protein diets have not been shown to cause kidney damage in the research. The advice to limit protein applies to people who already have kidney disease — an important distinction the scary version drops. If you have a kidney condition, follow your doctor's guidance.

Myth: protein leaches calcium from your bones

An old theory suggested protein acidifies the body and weakens bones. Current evidence points the other way — adequate protein, alongside enough calcium, generally supports bone health rather than harming it.

The real cautions

There are sensible limits. Extremely high intakes can crowd out other nutrients and fiber, so balance matters. Hydration helps. And more protein past your body's needs doesn't build extra muscle — it's just calories. The goal is enough, spread out, from good sources, not a mountain of it.

For most healthy, active people, hitting a moderately high protein target is safe and helpful. It's balance, not fear, that makes a diet work.

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