Answer:
main effect of eating
Explanation:
Hypothesis: In research methods, the hypothesis is described as a "proposed explanation" for a specific phenomenon. It requires the scientific method to prove it or test it. Different scientists, researcher, or experimenter generally base their hypotheses on the former observations that can't be explained satisfactorily with already available theories.
It is referred to as an explanation that a researcher tests or measures via experimentation or study.
As per the question, the researcher expects to observe the main effect of eating.