The three main meals model is not scientifically proven to be good or bad. It’s a product of culture, not medicine. Basically the government started saying, “Eat breakfast grow big and healthy” around the 1920’s. If you look at US agricultural trends, this coincided with the boom of grain production and industrial farming in the US, so what’s an easy way to get people to eat more grains, eggs, and meats? Make another meal seem like it’s important for your health. Lunch is a product of the industrial revolution and more specifically a result of Ford’s 40 hour work week, where working men needed hearty meals halfway through the workday. Dinner is dinner, and a late night meal makes generally the most sense out of any of those three meals (if you spent the day hunting prey or gathering food, you would eat the food when you’re exhausted at the end of the day).
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