Think you may be in the early stages of Alzheimer's disease?  Crack open your cupboards and break into a jar of peanut butter.  It's the test that researchers have found may help to indicate early stages of the disease.

Researchers at the University of Florida used peanut butter in a recent study to determine patients’ loss of smell in one nostril compared to the other.  They found that patients who were experiencing the early stages of Alzheimer’s disease tend to lose their sense of smell in one nostril more frequently than the other.  Which one?  The left.  

It turns out, peanut butter is what researchers refer to as a "perfect odorant."  In other words, it's a scent that is detected exclusively by the olfactory nerve.  In contrast, most other smells are also noted by the trigeminal nerve.  This nerve plays a key role in sensations that are felt in the face.  But when it comes to Alzheimer's disease, it's all about the olfactory nerve.  Dysfunction in this nerve is a good indication of degradation occuring elsewhere in the brain.  

In other words, a problem here indicates other problems that might be going on in the brain.

Check out the video below for more info on the research.