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Serum prostate-specific antigen but not testosterone levels decrease in a randomized soy intervention among men.

G Maskarinec1, Y Morimoto, S Hebshi

  • 1Cancer Research Center of Hawaii, University of Hawaii, Honolulu, HI 96813, USA. gertraud@crch.hawaii.edu

European Journal of Clinical Nutrition
|June 16, 2006
PubMed
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This pilot study found that men can adhere to a high soy diet, which may help lower prostate-specific antigen (PSA) levels. Further research is needed to confirm soy

Area of Science:

  • Nutritional Science
  • Oncology
  • Men's Health

Background:

  • Asian countries with high soy intake show lower prostate cancer incidence.
  • Soy foods may offer protective effects against prostate cancer.
  • This pilot study investigates soy's impact on prostate health markers.

Purpose of the Study:

  • To assess the feasibility of a randomized, crossover soy intervention trial in men.
  • To examine the effects of daily soy consumption on serum prostate-specific antigen (PSA) and testosterone.

Main Methods:

  • 24 men participated in a 3-month randomized crossover trial with high and low soy diets.
  • Dietary compliance was monitored via soy calendars, recalls, and urinary isoflavone analysis.
  • Serum PSA and testosterone levels were measured using radioimmunoassay.

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Main Results:

  • High adherence to the soy diet was confirmed by self-reporting and urinary isoflavone excretion.
  • A trend towards a 14% decline in serum PSA was observed during the high soy diet phase.
  • No significant changes in testosterone levels were detected.

Conclusions:

  • The study demonstrates the feasibility of conducting soy food interventions among free-living men.
  • High adherence suggests potential for larger trials investigating soy's role in prostate health.