Saletan recommends eating bugs:
Consider the nutritional value of the humble cricket: Each 100 grams of dehydrated tissue has 1,550 milligrams of iron, 340 milligrams of calcium, and 25 milligrams of zinc -- three minerals often lacking in the diets of third-world countries. If you're ever lost in the woods, three crickets a day will meet your iron needs. Compared to beef or pork, bugs deliver more minerals and healthier fats.
Bugs are also more energy-efficient. Crickets deliver twice as much edible tissue as pigs and almost six times as much as steers based on the same food input. And that's not counting their superior rate of reproduction. One scholar calculates that overall, they're 20 times more efficient than steers.
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