The Pulse Test: Revised Edition by Arthur F. Coca
This 186-page book thoroughly describes quite an easy "self-test" to determine your sensitivity to foods that can/could produce allergic reactions…that surprising range from asthma to seizures…some even produce migraine headaches, ulcers, and backaches.  It looked interesting, and I was able to purchase it at half of the list price of $12.00…which brings along a little tip.  They may be a bit shopworn or used (So perhaps inappropriate gifts); however, places like "Half-Price Books" and flea markets are a wealth of sources for health-related informational and Caregiving books for you.