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Why is there an increase in the prevalence of gynecomastia in young males?
Based on my observations I have noted that some young males take testosterone-based supplements to increase their muscle mass.
Once they stop these hormone supplements, the estrogen: testosterone ratio in their body gets disturbed, which is often followed by a rise in estrogen levels, which leads to enlarged breast tissue.
This is due to their testes becoming 'lazy' at producing testosterone as it was artificially supplemented.