system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How are humans so much more energy efficient than robots?

A human can eat two 1000 calorie meals (around 2 KWh) and then move around all day and run its brain and all other systems. A robot needs a lot more energy to perform the same tasks even if it's plugged in and doesn't need to carry a battery. There are sophisticated robots now that are as agile as humans if not more (like Boston Dynamics' Spot) but they need 2 KW every hour just to do what a human can do with 2 KW in 16 hours or more. Why do robots need to eat so much?

Edit: Correction, Spot has a 605 Wh battery which is good for 90 minutes of active operation.
gpt
Human body efficiency is usually quoted at around 20%, meaning 80% of energy input will be lost to waste heat, while 20% will be converted to useful work, as defined by the task. A brushless DC electric motor will usually end up between 70% and 95% efficiency - let's go with 80%.  
A human could convert 2KWh of meals into 0.4KWh of work. A purpose-built robot for a task solvable by electric motors could convert 2KWh of electrical energy into 1.6 KWh of work.  
  
Consider the possibility that some of the numbers or assumptions in your question might be faulty.