How much did humans eat in the past... I.e. I think we eat about 2500 a day now...what about in previous centuries?

In the past, daily caloric intake varied significantly based on geography, climate, and lifestyle. For example, during the pre-industrial era, the average daily intake could range from 1,500 to 3,000 calories, with subsistence farmers typically consuming around 2,000 to 2,500 calories a day. Hunter-gatherers might have had higher caloric needs due to their active lifestyles, while those in agrarian societies often consumed fewer calories due to limited food availability. Overall, diet and caloric intake have evolved dramatically with changes in agriculture, food production, and lifestyle.