I am a believer that all the poisons we are exposed ot daily between the air, food water... is an accelerant in our mpb. Meaning we were still destined for it, only at a later time...
That being said, once the damage is done, I do not believe changing a diet will stop mpb, because it was going to happen anyway, it just happened a lot sooner...
With regard to claims that baldness has always been around, yes it has however much later in peoples lives.
Heck look at old movies of people in the 40's, 50's, 60's... Not that many people were going bald under the age of 30... today I see a significant percentge of people under 30 suffering from mpb to some degree