The Claim

In young, healthy men engaged in regular strength training for 12 weeks, a high-carbohydrate diet (58% of calories) and a high-fat diet (40% of calories), both with adequate protein and caloric intake, do not significantly alter serum testosterone or estradiol levels, suggesting that macronutrient distribution within these ranges has minimal impact on sex hormone homeostasis in physically active males with normal baseline levels.

Source: The Combination of a Diversified Intake of Carbohydrates and Fats and Supplementation of Vitamin D in a Diet Does Not Affect the Levels of Hormones (Testosterone, Estradiol, and Cortisol) in Men Practicing Strength Training for the Duration of 12 Weeks

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
48score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Description
1 study reviewed
In plain English

In young, healthy men who regularly lift weights, eating a diet high in carbohydrates or high in fat—while maintaining sufficient protein and calories—does not change the levels of testosterone or estradiol in the blood.

See the scientific wording

In young, healthy men engaged in regular strength training for 12 weeks, a high-carbohydrate diet (58% of calories) and a high-fat diet (40% of calories), both with adequate protein and caloric intake, do not significantly alter serum testosterone or estradiol levels, suggesting that macronutrient distribution within these ranges has minimal impact on sex hormone homeostasis in physically active males with normal baseline levels.

What the research says

1 study

  1. Study: The Combination of a Diversified Intake of Carbohydrates and Fats and Supplementation of Vitamin D in a Diet Does Not Affect the Levels of Hormones (Testosterone, Estradiol, and Cortisol) in Men Practicing Strength Training for the Duration of 12 Weeks

    Scientists gave two groups of guys who lift weights different diets—one with lots of carbs, one with lots of fat—but their testosterone and estrogen levels stayed the same either way. So, what you eat (as long as it’s not extreme) doesn’t mess with these hormones in healthy, active men.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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