PRL and type 2 diabetes mellitus: In a new study of over 3,000 men aged 40–86 years published in this issue, we have shown that within the physiological range of PRL (up to 34.9 ng/ml), men with a low PRL level (< 3 ng/ml) at baseline had greater risk of developing type 2 diabetes by over five-fold compared to those with a high PRL level (≥ 5 ng/ml) [14].