0. Introduction This article proposes a hypothesis which reveals a long-standing question on why Japanese Edo-era people was so physically capable. Additionally, it may cast some lights to the cardiovascular diseases preventions or the epilepsy for the old. The key is the Magnesium accumulation inside organics, including human bodies. 1. Since 1600s' to 1930s' Japanese people supplied the fish meal fertilizer to grow crops 1.1 Overview In order to provide essential elements to crops, fish meal fertilizer is utilized on large scale. Vegetations except from crops are also provided into fields to provide organic elements. 1.2 Understanding the miracle recovery of the lost forest since 1700 in Japan―Contributions by Conrad Totman and, Google Gemini. Conrad Totman claimed in his book " The Green Archipelago: Forestry in Preindustrial Japan " (1989) that Japan recovered the forest in 18th century that she lost through previous few centuries depending on organized labour ...
