First, as people enter the global economic system, they become vulnerable to diseases such as obesity and diabetes. Second, development disrupts pre-existing ecological balances, often resulting in higher rates of bacterial and parasitic diseases (for example, lots of standing water from construction projects can increase malaria). Third, when development fails (as it often does), it leaves once self-sufficient societies living in impoverished, filthy slums, subject to the many assaults on health associated with such conditions.
