Loss of Appetite

As the title suggests, I've been experiencing a loss of appetite.
To tell you the truth, I don't really know when it started because I do have daily eating habits.
But recently there have been times where I forget to nearly eat all day and only remember around dinner time, and I don't feel a thing. I do have some slight nausea in the mornings, but nothing too extreme. And because of my lack of appetite, I'm not eating much during meals.
I have IBS and I was wondering if it might have anything to do with my sudden lack of hunger.
Just trying to eliminate possibilities...