Not off topic at all, this is something that is at the heart of sustainable living, and biodiversity.
The demand for Genetically-Modified-Organisms will decrease if we as consumers, boycott Genetically-Modified-Organisms products. Fast food chains use the cheapest products in their foods, and many times this is Genetically-Modified-Organisms product. If we don't eat at these places, they lose profits, and the suppliers lose profits, and down the chain, companies like Monsanto, lose profit.
The upside is that we will not lose our health, environment, and biodiversity.