Why the food is so important for some cultures

I live in Barcelona , and for us the food, cuisine, is one of most importants things in our lives. Many things happen around the meals, on the table, especially the lunch and dinner, it is curious but the less important is the breakfast, depending the person, some only have pure coffee during the first hour of the morning and later maybe a little sandwich, croissant..,etc the opposite of the rest of the world.
But the lunch is very important, if you work in general you have an hour for lunch and you have the lunch with your colleagues or some friends in a popular bar with a set menu from which you can choose two dishes: start and main, dessert or coffee , water or a glass of wine.
You have/one has dinner at home or occasionally at a restaurant or bar with family, friends, in general very late at/in the evening, around 9 pm to 10 pm.
But most important it is at the weekend, when you share the meals with family and friends, it is the moment to socialize and to show your big family all your love, for example, parents, grandparents, uncle, aunt... We communicate our feelings around the table, it is one of the ways to give and share fondness.

Great!

Why the food is so such important for in some cultures

I live in Barcelona , and for us the food and cuisine in general, is one of the most importants things in our lives. Many things happen around the during meals while we are around the on table. This is especially the case with the lunch and dinner. it is curious but Strangely enough, the breakfast is the least less important meal of the day. is the breakfast, Although this depends on the person as some only have pure coffee at the start first hour of the morning and then later on might could have a little sandwich, croissant..,etc which seems to be the opposite of the rest of the world.
But the (it is not grammatically correct to begin a sentence with "but") However, lunch is very important. If you work, in gerneral usually you will have an hour for lunch and this is normally spent with you have the lunch with your colleagues or friends some friend in a popular bar with a "menu" that you can which allows you to choose two dishies: an appetizer start and a main course plus dessert or and coffee , water or a glass of wine. 
The dinner Most of the time, we have dinner at home house or for special occasions at the a restaurant or bar with family or friends. in This meal is generally eaten very late on the at night, around 9 pm to 10 pm.
But the Weekends tend to be really important times when we it is at the weekend, when you share the meals with family and friends. it This is the time moment to socialize and to show your big family all your love, for example, parents, grandparents, uncles, aunts, etc. how much you love them. 
We communicate our feelings around the table as it is one of the best ways to give and share fondness for each other.

Well written Celia!  Most of my changes simply make your composition sound more natural.  Keep up your great work!