Frank Partnoy advocates for mandatory lunch breaks:
A mandatory break would be especially helpful for people who trade stocks during their lunch break. When I worked in Morgan Stanley's derivatives group in Tokyo during the 1990s, there was a mandatory halt to trading every day for 90 minutes during lunch. I was struck by the positive impact of the break on the tempo of trading. The pause led to more rational thinking about the trading day and often helped cooler heads prevail during times of stress. We read. We contemplated strategy. Sometimes we even ate.