Green food buffs an attribute's pool while green drinks buff regen, but you can only have one of these at the time because they do not stack.
Blue food and drinks will buff 2 attributes' pool/regen and for a longer time, but with slightly less strenght, and purple food and drunk does the same to all 3 attributes (health, magicka, stamina).
Bear in mind that the Wrothgar quest recipes are an exception to this.
Since we are on the same platform, give me a shout this evening in game and I will show you examples and craft you some stuff on your level for you to try out - there are over 400 recipes in game...
Orzorga's drink/food give you max HP and hp, magicka or stamina regen. I run my stam dk with +hp/stam regen and it's amazing.