I'm not sure what your question is asking. Are you asking if there are any studies indicating that hunter gatherers were forced to change their food producing practices to some other culture's or are you asking if there are studies indicating that people were forced into adopting the hunter gatherer lifestyle?
there are many hypotheses regarding the origins of agriculture if that helps. Some include the oasis hypothesis, the natural habitat hypothesis, the population pressure hypothesis, the edge hypothesis, and the social hypothesis. You can look these up online.