Omni is only one part of a complete search. Omni includes content from the various research databases to which QUL subscribes but not everything is included.
If you are looking for information on a very specific topic, or a topic that is subject specific, it is recommended that you search databases that specialize in that subject area for more thorough results. You may want to search more than one as they index different journals (as well as different types of resources).
Because food systems are so complex and multi-faceted, research in this area can draw upon a wide variety of disciplines and resources.
Multidisciplinary databases index a great number of publications and allow you to search across the disciplines and are a good resource to use when you begin your research.
Indexes and databases contain a variety of types of articles including popular (magazine) and academic or scholarly or peer-reviewed (journals).
If you are looking for scholarly or peer reviewed articles, you can typically restrict your search results to only peer reviewed journal articles by applying a search limit in the database.
Limit your search to Peer Reviewed articles, to Source Types such as Academic Journals or by Publication Date.
Most library databases provide the option to select Boolean Operators on the Advanced search screen, so all you have to do is select the operator you want from a drop-down box between search boxes.