If the study doesn't take chronotype into consideration, what does "early" even mean? Humans have a natural variation in our circadian rhythms, and 90% or so li

If the study doesn't take chronotype into consideration, what does "early" even mean? Humans have a natural variation in our circadian rhythms, and 90% or so lie within a 4h window. So you might eat before I wake up, or my breakfast might be your lunch.