Fruit and Vegies for Guinea Pigs

Question
We are somewhat confused about the vegies and fruit Guinea pigs can and can't eat.  The pet shop have advised us not to give them lettuce, rhubarb and beans.  Do you have a lists of fruit of vegies they can eat and those they definitely can't eat?  

Answer
Hello Ouri,
there are a lot things that they can eat including lettuce like romaine lettuce, peeled oranges, apples, green beans, kale carrots, broccoli as well as other fruits/veggies.
Here is a more extensive list of what you can feed guinea pigs.
http://guinealynx.com/charts.html