It was recently brought to my attention that olfactory training may help restore a lost sense of smell particularly after a viral upper respiratory infection or head trauma where no physical nasal obstruction is present. Olfactory training is analogous to physical therapy used to help restore limb movement after a stroke. Much of the basis found over the possible benefit of olfactory training stems from German research published in 2009 and later supported by a 2020 meta-analysis . One group…