(if it helps, I'm using the 2.2.0 version of FTB Revelation)
Note:Yes, this is only an assumption

My lazy self and my early-to-near-late game usage of easy food has me using wildberries as my main source of food, this is my first time trying Construct's Armory and I decide to make a snazzy suit of armor that happens to include the Calcic trait. This trait, procced normally by consuming milk (calcium is good for the bones), repairs some of the durability on the armor and gives a short term level of regen to you. Now every time I eat a wildberry (while wearing the armor) I get regen 4 for like 20 second and repair my armor a bit as well.

Though I don't like looking at code so I didn't want to bother to check it myself. I assume this is due to a weird property of the wildberry so I'm putting this here rather than on Construct's armor.

Note: I have not done extensive testing though a small amount of testing involving fall damage and natural regen was preformed to see the difference between eating a wildberry with and without the armor on, and the only other noteworthy thing I got from that is that yes, if I don't have all the armor on I only get a level of regen equal to the amount of pieces I have on.