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But the crowds proved so disruptive that the gallery eventually took the banana out of the booth after a performance artist, David Datuna, ripped it off the wall and ate it.

Where most previous studies of nutrition during pregnancy relied on a few days of food diaries, or on simply asking people what they remembered eating, the Stevens team asked pregnant people to take before-and-after photos of everything they ate over two 14-day periods.

"By looking at a longer time period, and using photos to track diet and nutrition, we're able to get a much richer and more precise picture of what people actually ate."

When pregnant people ate later in the day, the data shows, they were likely to consume significantly more total calories -- potentially an important finding as researchers explore connections between eating behaviors and health problems such as gestational diabetes.

As a result, students ate far more of the meals on offer, reducing food overproduction at the school by 20%.