Funny thing about these commodity bubble articles. There are an equal number of articles saying the opposite. I prefer ones that focus on fundamentals. Oil prices are driven by declining net exports, ya know less available to the world. Actually we are down 2.1 million barrels over the last 2 years for crude. So with increased demand from emerging markets, flat demand from the US and dramatically increasing consumption from oil exporting countries due to subsidies the price of crude is justified and will only skyrocket until ample alternatives come on line or we have a major crash of one of the big consumers of oil i.e. china, US etc… Actually the crack spread with refineries is very low and a gallon of gas should be over $5 now according to historical margins.
Food is a little more complex. Food commodities primary cost excluding transport is still fossil fuel. So obviously it will track crude up. There are a multitude of other variables but you should get the picture. oil is food. Google “the oil we eat”
Of course currency valuation plays are role but it is minor comparatively.
Peoples heads get so wrapped up in the chicanery of currency valuation and market manipulation you forget to look at the real world where stuff comes from. Our global energy and food system is stressed to say the least if you actually took the time to look at it.
