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I read through the article a couple times - anybody figure out why they are growing lettuce in a clean room?

The article only mentioned kidney disease, low potassium dietary restrictions, that the factory vegetable industry is going to grow, and that kids like factory lettuce better. No other details on motivations for getting into the factory vegetable business. The article makes it seem like the reason was just because they had the clean room facilities and they could - so why not?

No pesticide is used and because the lettuce is produced in a clean room, it stays fresh for about two weeks when stored at 10 degrees Celsius or lower.

More detail here: http://global.ofweek.com/news/Japan-s-chip-fabs-turn-to-grow...

Fujitsu Semiconductor and Toshiba Corp have both started to grow greens and believe the tightly-controlled conditions produce superior plants that can be tuned in terms of trace elements and therefore for taste or for specialized diets to meet health-care needs.

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