This is true. According to the stages of change model you have to go through several stages of change before any actual change occurs. They are precontemplation, contemplation, preparation, action and maintenance. The preparation stage would be where you have decided to make a change and are preparing yourself to make that change, then you would act upon your decision. You would still need to maintain that change.
You will want to eat more then usual and you gain weight.
That would be the nervous system.
Cultural factors, parental factors, mood, hunger cravings, health benefits, social setting, convenience, cost and allergies/intolerance are just some examples of factors that affect food purchases! Please let me know if you need any explanations! :)
