Trying to get my autistic kids to eat better

Restricted diets.  Honestly, sometimes it can be depressing.  There's no medical reason why my boys can't eat things.  They are not allergic to anything (that I know of) and to most people it looks like I feed my kids the same food every day due to laziness. But it's not that.  I am in fact desperate to get them to eat a a healthier diet even if it's in the same things they eat over and over again.  If you are in the same boat, here's some of the ideas we have tried.