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AndroGel Gynecomastia: Diet Protocols That Help

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At a glance

  • Key point / Gynecomastia is associated with testosterone replacement therapy [1]
  • Mechanism / Aromatase converts androgens to estrogens; estrogens stimulate breast tissue [2][3]
  • Body fat / Adipose tissue is one extragonadal site of estradiol production in men [4]
  • Soy / A meta-analysis found no statistically significant hormone effect from soy protein or isoflavones in men [5]

What is known about gynecomastia on testosterone

Gynecomastia is enlargement of male breast tissue. It is listed among side effects associated with testosterone replacement therapy [1]. A review notes estrogens stimulate breast tissue and androgens inhibit it, and most cases come from deficient androgen action or excessive estrogen action [3].

Why food claims are limited

Aromatase converts testosterone to estradiol [2]. In men, estradiol is also produced in extragonadal sites that include adipose tissue [4], which makes body fat biologically relevant to estrogen production. That does not show that a particular food or amount of weight loss changes gynecomastia.

What the food data show

Soy: a meta-analysis of 15 placebo-controlled treatment groups found no statistically significant effect of soy protein or isoflavones on total testosterone, SHBG, free testosterone or free androgen index in men; it did not measure gynecomastia [5].

Alcohol: a review proposed increased aromatization as a possible mechanism for feminization in some male alcoholics, and reported that chronic heavy alcohol increased aromatization of androgen in the liver of male rats [6].

Zinc: in rats, a zinc-deficient diet increased liver conversion of testosterone to estradiol and lowered serum testosterone, estradiol and LH [7]. That is not evidence of a benefit in men.

Frequently asked questions

Is gynecomastia a known side effect of testosterone treatment?
Yes. Gynecomastia is listed among side effects associated with testosterone replacement therapy [1]. A review notes estrogens stimulate breast tissue and androgens inhibit it, and most cases come from deficient androgen action or excessive estrogen action [3].
Does soy worsen gynecomastia on testosterone?
A meta-analysis of 15 placebo-controlled treatment groups found no statistically significant effect of soy protein or isoflavones on total testosterone, SHBG, free testosterone or free androgen index in men [5]. It did not measure gynecomastia.
Does alcohol raise estradiol on AndroGel?
A review reported that chronic heavy alcohol increased aromatization of androgen in the liver of male rats, and proposed increased aromatization as a possible mechanism for feminization in some male alcoholics [6].
Is zinc an aromatase blocker for gynecomastia?
The zinc data are from rats: a zinc-deficient diet increased liver conversion of testosterone to estradiol and lowered serum testosterone, estradiol and LH [7]. That does not show a benefit for gynecomastia in men.

References

  1. Luther PM, Spillers NJ, Talbot NC, Sinnathamby ES, Ellison D, Kelkar RA, et al. Testosterone replacement therapy: clinical considerations. Expert Opin Pharmacother. 2024;25(1):25-35. Testosterone replacement therapy: clinical considerations
  2. Cooke PS, Nanjappa MK, Ko C, Prins GS, Hess RA. Estrogens in Male Physiology. Physiol Rev. 2017;97(3):995-1043. Estrogens in Male Physiology
  3. Narula HS, Carlson HE. Gynaecomastia--pathophysiology, diagnosis and treatment. Nat Rev Endocrinol. 2014;10(11):684-98. Gynaecomastia--pathophysiology, diagnosis and treatment
  4. Simpson ER. Sources of estrogen and their importance. J Steroid Biochem Mol Biol. 2003;86(3-5):225-30. Sources of estrogen and their importance
  5. Hamilton-Reeves JM, Vazquez G, Duval SJ, Phipps WR, Kurzer MS, Messina MJ. Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men: results of a meta-analysis. Fertil Steril. 2010;94(3):997-1007. Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men: results of a meta-analysis
  6. Purohit V. Can alcohol promote aromatization of androgens to estrogens? A review. Alcohol. 2000;22(3):123-7. Can alcohol promote aromatization of androgens to estrogens? A review
  7. Om AS, Chung KW. Dietary zinc deficiency alters 5 alpha-reduction and aromatization of testosterone and androgen and estrogen receptors in rat liver. J Nutr. 1996;126(4):842-8. Dietary zinc deficiency alters 5 alpha-reduction and aromatization of testosterone and androgen and estrogen receptors in rat liver
Evidence overview for AndroGel Gynecomastia: Diet Protocols That Help