Snacking is less common in Spain and I've found the junk food options less delicious than American snack foods. Spaniards are really big on ketchup flavored chips (which are admittedly not my favorite)!
The final meal of the day is la cena (dinner). Spaniards eat a light dinner, whereas the typical American will enjoy dinner as their largest meal of the day. Living in Spain, I've acclimated to eating a late dinner, usually between 9 and 10pm. Would you enjoy eating dinner so late?
Food in España is quite connected to the medioambiente local (local environment)! The food stocked at Spanish grocery stores is usually local or at the very least produced in Spain. Spaniards often follow a seasonal diet, enjoying cold soups like gazpacho and salmorejo in the verano and hearty stews in the colder months. In el otoño it's very común to eat roasted castañas (chestnuts).
Coastal regions like Galicia have strong maritime influence and seafood is the center of many dishes, no matter the season. People travel to Galicia from all around the world to enjoy the maríscos. Many people here think it's a shame that I'm vegetariana, because seafood and meat form such an integral part in Spanish cuisine, across all regions. Overall though, Spanish people are very kind and accomodating and there are definitely vegetarian and vegan people here, too. In fact, my city, Vigo, hosted a Vegan festival this otoño!
I hope you've enjoyed learning about la comida de España!