PET scans show many Alzheimer’s patients may not actually have the disease
Pet scan: $3000 - $4000 
Peanut butter: $3 - $10<p><a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3823377/pdf/nihms514234.pdf" rel="nofollow">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3823377/pdf/nih...</a>