The goverment or media won't tell you this, but I will...

[AirTight]

Weed out as much of the processed foods from your diet that you can.

 

[Sunsettommy]

Also go for the pasture or grass fed meats, and cage free/open range eggs and chickens.

 

[Moonglow]

I use weed in unprocessed foods, but wait, isn't flour processed milled wheat?