Japan has a population of 127 million people within a relatively small land area, giving it a high population density. The country has four distinct seasons and a mild climate overall. Japan's economy uses the yen as currency and has a gross national income of $4.265 trillion. Agriculture faces challenges due to limited farmland but rice production is important. Fishing is also a major industry. The Japanese diet emphasizes fish and is linked to the population's long life expectancy and low disease rates. Food presentation and meals are an important cultural aspect.