what kenneth said is right! it really depends on how much you eat regularly. some ppl skip breakfast sometimes and cook during weekends, so they would pick light. others eat constantly so regular is definately the choice. Just keep in mind that, your BASIC money cannot be refunded!! so alot of people choose to pick a smaller meal plan and add money on later if they need more money. That way, you don't lose any money or start buying random junk at the end of the year just to use hte money up.
I personally, buy the smallest meal every year, and i never finish it. but that is just me. i eat lunch and dinner but i do cook on the weekends sometimes.
i've noticed that the meals on res are getting really big now, so i split one meal in to two sometimes! so that might be why too. hope that helped.