No on can prove the specific reason, I'm sure any reason that is explored will get push back from businesses who have interests in that area, for example if it'

No on can prove the specific reason, I'm sure any reason that is explored will get push back from businesses who have interests in that area, for example if it's because of sugar, mobile phones, pesticides or pollution, all those industries will fund counter claims. It's sad but that's the capitalist world we live in, the problem will get so bad even the owners of these businesses will be affected but foolish enough to continue for the pursuit of greed and profit, knowingly or unknowingly destroying the chance of future, healthy offspring.