The date is a pun:
Good carrot → ii ninjin → ii ni(njin) → i(1) i(1) ni(2)
Carrots are considered to be so nutritional that the health enthusiast Tokugawa Ieyasu loved to eat them!
They say that "the fresher the vegetable, the more bugs will come to it", but it seems like the vegetables that humans find tasty are the ones composed of a high amount of macromolecules such as cellulose and phytochemicals, which make them hard to eat for bugs.
Quote from "Miracle Carrot Juice"
From the looks of it, the quote is not the whole text, but the line about "the fresher the vegetable, the more bugs will come to it". The explanation they provide is the same though.This is pretty high-quality stuff-usa~!munchmunch
