Had you said "riots" or "insurrections," I would agree, but I can't think of any war being fought because of food shortages. Wars are fought over "power" and "control of land mass and the subjects who occupy it." Except for the Islamic followers. They fight for their Allah.
Food is power.”riots” or “insurrections,” caused by lack of food usually lead to war either in an effort to fill the bellies or in an effort to blame the empty bellies on others.