If people can't eat, they can't do much else. One of the great achievements of the past century has been the enormous expansion of food production, which has virtually eliminated starvation in advanced countries and has made huge gains against it in poor countries.

Since 1961, world population has increased 112 percent; meanwhile, global production is up 164 percent for grains and almost 700 percent for meats. We owe this mainly to better seed varieties, more fertilizer, more mechanization and better farm practices.

Food in most developed countries is so plentiful and inexpensive that obesity - partly caused by overeating - is a major social problem.

But the world food system may now be undergoing a radical break with this past. The "end of cheap food" is how the Economist magazine recently described it.

During the past year, prices of basic grains (wheat, corn) and oilseeds (soybeans) have soared. Corn that had been selling at about $2 a bushel is now more than $3; wheat that had been averaging $3 to $4 a bushel has recently hovered around $9.

Because feed grains are a major cost for meat, dairy and poultry production, retail prices have also risen.

In the United States, dairy prices are up 13 percent in 2007; egg prices have risen 42 percent in the past year. Other countries are also experiencing increases.

Higher grocery prices obviously make it harder to achieve economic growth and low inflation simultaneously. But if higher food prices encouraged better eating habits, they might actually have some benefits in richer societies.

The truly grave consequences involve poor countries, where higher prices threaten more hunger and malnutrition.

To be sure, some farmers in these countries benefit from higher prices. But many poor countries - including most in sub-Saharan Africa - are net grain importers, says the International Food Policy Research Institute, a Washington-based think tank. In some of these countries, the poorest of the poor spend 70 percent or more of their budgets on food.

About a third of the population of sub-Saharan Africa is undernourished, according to the Food and Agriculture Organization of the United Nations.

That proportion has barely changed since the early 1990s. High food prices make gains harder.

What's disturbing is that the present run-up doesn't seem to be temporary. Of course, farming is always hostage to Mother Nature, and drought in Australia has cut the wheat harvest and contributed to higher worldwide prices.

But the larger causes lie elsewhere. Read rest of story...

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