I guess you have to eat a bit more if you ride more, I certainly notice when I bike to work (5mi each way, 300ft climb) that I need to eat a bit more food. Certainly no where near the energy of a car though but its not zero. Assuming you want to maintain your weight.

> vehicle life cycle emissions considered emissions from the manufacture of vehicles, with aggregate carbon values per vehicle type (cars, motorcycles, bikes and public transport vehicles) derived assuming typical lifetime mileages, mass body weights, material composition and material-specific emissions and energy use factors.

and

> The observed e-bike share was 4.5%; therefore, average emissions include 4.5% e-bike, 95.5% normal bike.

It’s not totally clear to me if the emissions required to produce the energy the human burned to power the bicycle are included—it would certainly vary quite a bit based on the food.

I would assume from the manufacture of the bicycle.

The bike does need energy to move.