LONDON — At some point — perhaps it was gazing at a Le Pain Quotidien menu offering an “organic baker’s basket served with organic butter, organic jam and organic spread” as well as seasonally organic orange juice — I found I just could not stomach the “O” word or what it stood for any longer.

Organic has long since become an ideology, the romantic back-to-nature obsession of an upper middle class able to afford it and oblivious, in their affluent narcissism, to the challenge of feeding a planet whose population will surge to 9 billion before the middle of the century and whose poor will get a lot more nutrients from the two regular carrots they can buy for the price of one organic carrot.

An effective form of premium branding rather than a science, a slogan rather than better nutrition, “organic” has oozed over the menus, markets and malls of the world’s upscale neighborhood at a remarkable pace. In 2010, according to the Organic Trade Association, organic food and drink sales totaled $26.7 billion in the United States, or about 4 percent of the overall market, having grown steadily since 2000. The British organic market is also large; menus like to mention that bacon comes from pampered pigs at the Happy Hog farm down the road.

In the midst of the fad few questions have been asked. But the fact is that buying organic baby food, a growing sector, is like paying to send your child to private school: It is a class-driven decision that demonstrates how much you love your offspring but whose overall impact on society is debatable.