Hello!
I believe that the factors of Jason sticking to his healthy-eating plan are food availability and dietary guidelines. I believe that if fast food wasn't available to him as often then he'll gradually lose that temptation of cheating on his diets and dietary guidelines might help him stay on track on his diet and even help him make a healthier version of what he was tempted to eat before.
I hope this helps!
Answer:
the answers are the first one and the third one
