[endless1234]

Humans are quite inefficient - we can convert around 25% of food energy to work. The losses in the power plant generating the electricity for charging the e-bike's battery and the motor's efficiency losses would result in a higher overall efficiency than 25%.

[makapuf]

People generally dont need more calories that they already have, they need less. They must do (but dont do enough) physical exercice to loose extra energy they consume (in places where cars are an issue).

[endless1234]

Sure, but that doesn't really play into the equation when comparing the pure efficiency of different transportation methods. Of course in practice since it's good to exercise at least 30min daily, you can think of the energy spent during that as free from a efficiency standpoint