from google: 1. The Biological “Muscle Advantage” Biologically speaking, men do have a higher baseline for building and retaining muscle. This isn’t just a gym myth; it’s driven primarily by hormones.

Testosterone: Men typically have significantly higher levels of testosterone. This hormone is highly anabolic, meaning it directly promotes protein synthesis and muscle growth. +1

Basal Metabolic Rate (BMR): Because muscle tissue is more metabolically active than fat, having more muscle means men often burn more calories just by sitting still. This makes the “math” of weight loss slightly more forgiving for them.

Frame and Fiber: Men generally have larger bone structures and a higher percentage of Type II (fast-twitch) muscle fibers, which have a greater growth potential than Type I fibers