Do you think the amount of nutrition/ diet people are on is the reason why people are hairier

In part yes, particularly where there are existing conditions like polycystic ovarian syndrome. PCOS has been linked with eating high levels of red and processed meat and definitely worsened by a poor diet high in fat and carbs.

This condition causes the ovaries to start producing excess androgens, (male hormones) so you get irregular periods, acne and drum roll... Extra hair growth.

It also causes insulin resistance which in turn signals the ovaries to produce more male hormones and so more hair, acne and weight gain, especially around the stomach.