Food

Protein intake (by age)

Dietary factor.

In practice

It depends on the case; there is no single guideline.

Effect by goal · level of evidence

IGF-1, cancer, and mortality

association Low-moderate study (A)

75%

Study in people (with confirmation in mice): between ages 50-65, a high-protein diet was associated with 75% higher mortality and 4 times more cancer death (attenuated if the protein was plant-based). In people over 65, high protein was associated with LOWER mortality. 'Optimal' protein depends on age. Observational.

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In depth

Diet · Highest evidence: Low-moderate · 1 finding

Findings

IGF-1, cancer, and mortality — association (Low-moderate, study). Study in people (with confirmation in mice): between ages 50-65, a high-protein diet was associated with 75% higher mortality and 4 times more cancer death (attenuated if the protein was plant-based). In people over 65, high protein was associated with LOWER mortality. The "optimal" protein depends on age. Observational. 24606898

Information, not medical advice. Prescription drugs require a doctor.

Information, not medical advice. Scientific evidence reflects the quality of the studies.