I have difficulty getting Duke's here, but most unfortunately my bride has British taste buds and is decidedly Yankee in nature and likes Kraft. Oh well...
Now days, the first thing I do is read the ingredients with my cell phone.
When I see, bio-engineered/GMO and a list of ingredients that I need to use my cell phone exactly what they are I never ever buy those products.
For example: I grew up using Helmsman Mayonnaise. Now days it is made with bio-engineered/GMO so I never buy that product. I now buy Mayonnaise with only the same ingredients as the foods we all grew up with.
Also, for example If I want say chocolate by Nestle made in the USA it is listed with bio-engineered/GMO so as I live in a latin area with a few latin stores, I can get the same Nestle chocolate made outside the USA made with chocolate, eggs, milk, sugar, just like the chocolate we grew up with.
I have found that outside the USA there are laws that forbid many of the USA foods that are carcinogen types of foods.
NOTE: if you really care about your health, choose wisely