Genetically modified foods can be very good, and very bad, depending on the circumstances. I view it as morally neutral on the whole. Centuries ago the idea of selective breeding and splicing to create new varietals, new fruits, more disease resistant crops, etc., probably seemed unnatural to some. In another few centuries genetically modified food will seem old hat and uncontroversial and there will be some other cause celebre for the world's richest and best-fed people groups to get their dander up about.
That is, unless the Great Prophet Zarquon returns first!!