There’s a scientific explanation for why people love donuts at the office. A study recently published in Psychosomatic Medicine reveals that “knowledge-based work” causes people to eat much more than normal, even though their brains are technically performing at the same level of activity as if they were just sitting around. The researchers behind the study offer two possible explanations: One is that eating stabilizes blood glucose levels, which the brain relies on heavily. As evidence, the researchers show that glucose levels change when performing knowledge-based work. The other explanation is that knowledge-based work increases stress, and it’s well-documented that stress leads to increased appetite. Either way, it’s probably a good idea to keep the Snickers out of reach as deadlines approach.