Explain my slightly elevated cholesterol!?

I have a slightly elevated cholesterol of 208 in my most recent blood work. I am 28 years old, slightly underweight and a vegetarian (I eat fish as well) with no family history of high cholesterol. I have never had high cholesterol readings in any previous blood work. What could be the cause of this? Is it possible that I am very sensitive to any kind of animal products and that I should eliminate eggs and all dairy from my diet? I typically eat low fat or reduced fat yogurt – I am lactose intolerant so dairy is not a huge part of my diet. I don’t eat a lot of shellfish and I very rarely eat butter. I use Olive Oil and Canola Oil for any kind of cooking oils and I really dislike fried foods. Please share with me any thoughts or experiences regarding my recent elevated cholesterol if you have any. Thank you.