MSTN and type 2 diabetes mellitus: A number of studies agree with our findings that fasting serum myostatin levels are higher in men versus women (Bergen et al., 2015; Garcia‐Fontana et al., 2016; Kurose et al., 2021; Toloza et al., 2018) and decline with aging among adults without type 2 diabetes (Bergen et al., 2015; Lakshman et al., 2009).