No, unless you plagiarise their website or web presence.
(Although (nice though the place is) best of luck with "Foodie" in Vancouver......
If foodie.com is an already registered domain name, would vancouverfoodie.com be too similar? could i face legal issues using this domain?
If the name is available for registration then you can safely use it. You probably know that foodle.com is not being used but has been purchased by a speculator who is offering it for $US22K. That's nonsense.
You can have foodle.com for nothing. It's available now to register in Canada (that is http://www.foodle.com.ca).
You can also register vancouverfoodle if you want but that seems rather clumsy to me.
You can try website name generator which finds the right domain name for your website. A simple tool that identifies catchy domains available and gives you the tools to register them on the spot.
As far as word food is concerned its a dictionary work and not trademarked one. So you can register vancouverfoodie.com, IMO