I claim we eat dessert after dinner — separating high-sugar foods from other foods — so that we are more likely to get sugar near bedtime. We need sugar near bedtime to sleep well, I suspect. Donald Knuth, the computer scientist, seems to disagree:
Donald Knuth came on time [to dinner at a Stanford dorm] and started his dinner with dessert. Only after he finished the cake he proceeded to the salad. He explained that order of courses by not being consistent.
Perhaps he’s been reading Taleb, who stresses the value of randomness. I would have been more impressed had he eaten the cake at the same time as the rest of the meal.