We know that eating disorders are biologically based, and that your risk is mostly influenced by the genes you are born with (53-83%, higher than any other mental illness). We don't know exactly how it works or what combination of genes, epigenetics, and environment are involved.
Think of an uncharted map, a large one. It may take a lot of identifying which genes DON'T affect risk but then every once in a while there's a hit, too. This is big. Genes won't explain everything - there are only a handful of diseases for which finding a single gene was all we needed to know - but knowing where to start will help us identify and change the environmental influences as well.
Keep going, researchers, and thank you!