This has happened to me several times over the years. I've come to recognize that it means my vision has become limited. As the others have noted, various cuisines, cooking methods and techniques and food sources are all sources of inspiration.
The next time you are at the supermarket, take a closer look at the products you take for granted. Pickles, relishes, condiments, breads and pastries. Do you know how to make every item from scratch? How difficult would it be? Pick one and try it.
Visit any nearby ethnic markets to see what they offer.
Take a food based road trip. Visit the source of whatever is available in your area. Take a winery tour. Visit a farm during the growing season. Ask to see the kitchen of a small, locally owned bread maker.
Ever done decorative sugar work or used salt dough?
This is not a comprehensive list of all the different food based interests there are. But it's a place to start.