Earlier quoted context omitted.
A human burns say 2000 kcal / day. That's about 2.3kW hours / day. An iPhone 16 pro battery appears to have about 18 watt hours. So approximately 100x less then a human uses.
Oops, you're right, I misremembered some basic facts here...
The engine came up more favorably.
Turns out, eating any meat and industrial agriculture transportation are really heavy.