Human energy needs are incredibly variable so the estimates for normal consumption are wrong for most people, but when you get into essential systems (basically cardiovascular and nervous, not even including digestive or any muscle movement) you actually need even less - the average (by weight, height & age) man needs 1950kcal or so and the average woman (by height, weight & age) needs 1450kcal or so

When we replace AI with brains in jars I’m sure we can cut it down even more though