The quantitative easing (printing money) has effectively been used to devalue the dollar, not quite sure if has achieved it yet, but it will given the amount of debt that the US is sitting on. This could potentially back fire on Bernanke.
Im not entirely sure what the net value of food or fuel imports is into the US. But although US goods will be cheaper to the rest of the world, the cost of importing food items and fuel into the States could rise significantly.
The impact of this could be a reduction in fat people across America, which will certainly help the health care costs.
The other impact could be the reduction in America's disposable household income. This could have significant issues for the American economy in the medium term.