Such food, whether it be a neatly wrapped fly, or the body of the dead male, provides nutrients for the female, allowing her to produce bigger or more numerous offspring, to the ultimate benefit of the father's genes.

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It is also unclear whether animal clones can be sold for use as food.

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Population science is once more centre-stage, pushed by climate change, which raises worries about the impact so many billions have on the environment of the earth, and food-price spikes, which imply doubts about whether it will be possible to feed them all.

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"This bagged produce, whether it's lettuce or spinach or melons, is what I consider to be a potentially hazardous food, " says Michael Doyle, a microbiologist who heads the food safety center at the University of Georgia.

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What I don't like about sustainable foodies and I'm considered one of them is that we carry an air of preachiness about food. (No one wants to be told what to eat, whether it's by your mother or by a group of holier-than-thou chefs.) But true sustainability is about more than just deciding to cook with local ingredients or not allowing your child to have corn syrup.

WSJ: Dan Barber's Culinary Crusade

It is debatable whether the various British cultural attitudes to doggy bags will be overcome to help reduce the amount of food thrown away.

BBC: Doggy bag: Why are the British too embarrassed to ask?

Even after a medical food or supplement is brought to market, it can be difficult for consumers to figure out whether it works.

WSJ: 'Medical Foods' and Supplements for Brain Health Advance