Hair

Men who eat soy lose less hair

By WhyStopHarmingAnimals.com

Men who eat soy regularly lose less hair[1]. In the populations studied, regular soy intake came with about 77% lower risk of androgenic alopecia[1], the common hormone-linked pattern of hair loss in men. Later work on soy isoflavones and hair loss has pointed the same way[2].

The folklore about soy runs the opposite direction: that it disrupts male hormones and should be avoided. Clinical studies in men find soy protein and isoflavones do not change testosterone, free testosterone or estrogen at any dose tested[3], so there is no hormonal harm to set against the hair finding.

Meat on the other side

The evidence comes from both ends of the plate. A study of meat intake and androgenetic alopecia found that higher meat intake was associated with greater risk of hair loss[4]. Soy tracks with less of it and meat with more[1][4], which is the pattern you would expect if diet has a real effect.

What the studies can show

All three studies are observational. They compare people who already eat differently, which cannot prove that soy protects hair or that meat speeds its loss, and androgenetic hair loss has a strong genetic component that no diet removes. None of them is a trial.

Within those limits, the results agree with each other[1][2][4], and none of them suggests that leaving animals off the plate costs anyone their hair[1][2][4].