Spark don't pre-choose, or even authorise, the ads you see. They subscribe to an ad service which sells the ads for them, and the ones you see are driven by what key words are on the page. It's called context-sensitive advertising.
So on food pages, you see a lot of food ads, yeah.
Pasta is fine.
But if you do see something inappropriate (such as "lose 20lbs this week with this one weird old tip") then here's what to do about those ads: www.sparkpeople.com/resource/motivation_ar