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Combining Behavioral Endocrinology and Experimental Economics: Testosterone and Social Decision Making

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High-protein diets and testosterone.

Joseph Whittaker¹

¹The School of Allied Health and Community, University of Worcester, UK.

Nutrition and Health

|October 21, 2022

Summary

This summary is machine-generated.

Very high-protein diets (>3.4g/kg/day) may decrease testosterone, but high- and moderate-protein diets (1.25-3.4g/kg/day) do not. This clarifies protein intake

Keywords:

Protein androgens high-protein diet men protein intake testosterone

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Area of Science:

Endocrinology
Sports Nutrition
Human Physiology

Background:

Recent meta-analysis linked low-carbohydrate, high-protein diets to decreased testosterone in men.
The term 'high-protein' lacks standardized definition, causing confusion in research interpretation.
Understanding protein intake thresholds is crucial for hormonal health in athletes and general population.

Approach:

Systematic review and meta-analysis of existing studies on diet and male hormone levels.
Proposed clear definitions for protein intake levels: very high (>3.4 g/kg/day), high (1.9-3.4 g/kg/day), moderate (1.25-1.9 g/kg/day), and low (<1.25 g/kg/day).
Analyzed the association between these defined protein intake levels and changes in total testosterone.

Key Points:

Diets exceeding 3.4 g/kg/day (very high protein) were associated with a decrease in total testosterone.
High-protein (1.9-3.4 g/kg/day) and moderate-protein (1.25-1.9 g/kg/day) diets showed no consistent negative impact on testosterone levels.
The majority of individuals, including athletes, consume protein amounts below the threshold linked to testosterone reduction.

Conclusions:

The definition of 'high-protein' intake is critical for accurate interpretation of its effects on male testosterone.
Very high protein intake (>3.4 g/kg/day) may negatively impact testosterone, while intakes within the high and moderate ranges do not.
Proposed definitions provide a clearer framework for future research on protein intake and hormonal health.