Can diet affect my spinal stenosis?

No: Aside from keeping weight well controlled, diet should not play a major role in spinal stenosis.

Yes: Getting obese can lead to increased lumbar degenerative changes leading to further narrowing of the spinal canal leading to increased degree of spinal stenosis.

Not really: Diet can affect a lot of things, but once you already have stenosis, diet has little or no effect with the exception that carrying extra body weight can certainly make it more symptomatic.