Test detail

Thank you for your question. First, let me clarify one point about the numbers. Japan's current food self-sufficiency rate (on a calorie basis) is approximately 38%, and the figure of "20%" applies to certain specific items (e.g., oils/fats at 4%, wheat at 18%), but 38% is the latest official aggregate figure from the Ministry of Agriculture, Forestry and Fisheries. Below, I will explain in detail why Japan's food self-sufficiency rate has declined to this level from the postwar period to the present, breaking down the analysis into multiple factors.

🍚 Why Is Japan's Food Self-Sufficiency Rate So Low?

① First, let's confirm the current figures

According to the Ministry of Agriculture, Forestry and Fisheries' "FY2024 Food Self-Sufficiency Rate Report," the calorie-based food self-sufficiency rate has declined from 73% in FY1965 (Showa 40) to 38% in FY2024 (Reiwa 6)—a drop of more than half over 60 years.

In 1946 (immediately after World War II), Japan's food self-sufficiency rate was 88%. However, it began to decline gradually, falling below 50% during the Heisei period, and since the 2000s has remained around 40%, relatively flat.

② Rapid Westernization of Postwar Diet

A major factor in Japan's declining food self-sufficiency is the dramatic shift in eating habits after the war. While rice was once Japan's staple food, as the nation recovered and grew wealthier in the postwar period, dietary patterns shifted toward Western food. As a result, rice consumption fell while demand for meat and bread surged.

From the late 1950s through the 1970s, as the economy developed, the diet shifted from rice-centric to diverse foods including bread, noodles, meat, and dairy products. Since wheat, animal feed grains, oils/fats, and meat are largely imported, Japan's overall self-sufficiency rate dropped significantly.

③ High-Price Policy for Domestic Rice and Preferential Treatment of Imported Wheat

A major cause of declining self-sufficiency was raising domestic rice prices substantially to reduce consumption while keeping imported wheat prices fixed for an extended period to increase consumption. Around 1960, rice consumption was more than three times that of wheat, but today the two are consumed in roughly equal amounts.

④ Acceptance of U.S. Surplus Agricultural Products and Effects of the Agricultural Basic Law

In postwar food policy, although food production was initially increased, the establishment of an acceptance framework for U.S. surplus agricultural products through MSA agreements led Japan to abandon self-sufficiency in all but rice. The Agricultural Basic Law solidified this direction, causing domestic non-rice crop production to collapse and sharply reducing self-sufficiency in wheat and soybeans.

⑤ Decline in Agricultural Workers and Loss of Farmland

Core agricultural workers have declined by 30% in just a decade, and farmland exceeding the area of Tokyo has been lost, bringing agriculture to a critical juncture.

The aging of producers, the increase in cheap imported foods, and rural youth migration have reduced the producer base. Additionally, while the Agricultural Land Law aimed to solidify the achievements of land reform by strengthening tenant rights, it failed to establish producer obligations. These systemic and operational issues in agricultural land law have allowed small-scale part-time farming to persist, hampering structural reform while reducing agricultural land resources essential for food security.

⑥ Low International Competitiveness of Agricultural Products and Trade Liberalization

The fundamental cause of declining self-sufficiency lies in international economic relations surrounding agricultural trade—in other words, in the competitive position of each agricultural product. Japan's protection of rice and many other agricultural products through the Uruguay Round negotiations reflected the fact that most Japanese agricultural products lacked international competitiveness.

⑦ Severity of Self-Sufficiency by Product Category

According to the Ministry of Agriculture's "Self-Sufficiency Rate by Product (FY2022)," beef is 38%. When excluding beef raised on imported feed, beef self-sufficiency drops to just 11%. Pork stands at 49% and chicken at 64%, but when excluding animals raised on foreign feed, these figures fall to 6% and 9% respectively. Other figures include wheat at 18%, soybeans at 26%, fruits at 29%, sugars at 26%, and oils/fats at 4%.

⑧ The Contradiction of Food Waste

In FY2024, Japan's food waste totaled 4.61 million tons, comprising 2.24 million tons from households and 2.37 million tons from businesses. Economic losses from food waste reach approximately 3.8 trillion yen annually, or about 31,097 yen per capita. This contradiction of importing much while discarding vast quantities represents one aspect of Japan's food security challenge.

⑨ Risks from Low Self-Sufficiency

The impact of Russia's invasion of Ukraine on natural gas and wheat flour prices—causing sharp increases—has become widely recognized. Even with favorable relations and stable supplies from trading partners, dependence on other nations means vulnerability to their circumstances.

📌 Summary

The government has set a goal of raising self-sufficiency to 45% by 2030, but current circumstances make achievement difficult. Food self-sufficiency is not merely an agricultural issue but a complex structural challenge intertwining national security, food culture, climate change, and economic policy.

Japan's food self-sufficiency rate is low due to several factors.

1. Agricultural Conditions:

• Japan is mountainous, with limited land suitable for farming.
• Climate conditions vary widely, and few areas are suited for large-scale agricultural production.

2. Changes in Diet:

• After the war, Japanese eating habits changed dramatically, with many people consuming bread, meat, and dairy products from foreign sources.
• Imported foods are often cheaper, and consumers tend to choose imported products for their cost-effectiveness.

3. Decline and Aging of Agricultural Population:

• Young people leaving agriculture and aging farmers have reduced agricultural productivity.
• Labor shortages impair agricultural efficiency.

4. Policy and Economics:

• Japan relies heavily on imports from other countries, and international economic policies and free trade agreements have increased imports of foreign agricultural products.

5. Technology and Efficiency:

• While technological innovation has advanced in some agricultural sectors, it has not necessarily improved overall efficiency.

These factors combine to keep Japan's food self-sufficiency low. The Japanese government is implementing various measures to improve the rate, but long-term efforts are required.

Japan's food self-sufficiency rate is sometimes quoted as "20%," but the calorie-based aggregate food self-sufficiency rate published by the Ministry of Agriculture, Forestry and Fisheries has hovered around 38% in recent years, registering 38% in FY2022. This figure represents a particularly low level among major developed nations.

The main reasons Japan has experienced low food self-sufficiency levels in the postwar period are as follows:

1. Westernization and Diversification of Diet

• After the war, Japanese dietary patterns shifted dramatically from a rice-centered traditional diet to one emphasizing meat, dairy products, and oils—Western-style consumption.
• Production of these livestock products and processed foods requires large quantities of feed grains (such as corn) and soybean-based oils, most of which are imported from overseas.
• For example, domestically produced meat often relies on imported feed and is therefore counted as an import in self-sufficiency calculations.

2. Weakening of Agricultural Production Base

• Decline in farmland area: Agricultural land has decreased due to residential development and abandoned farmland.
• Aging of agricultural workers and shortage of successors: The agricultural workforce is aging, and few young people pursue farming. Low agricultural income compared to other industries contributes to this succession problem.
• Climate and geographic constraints: Japan has limited flat land suitable for large-scale cultivation of crops. Wheat, soybeans, and corn—crops produced in massive quantities internationally—depend on imports from countries with vast arable land and favorable climates (U.S., Canada, Australia, etc.).

3. International Division of Labor and Pursuit of Economic Efficiency

• From postwar reconstruction through the period of rapid economic growth, Japan pursued a path of "international division of labor," exporting manufactured goods and importing inexpensive food with the profits.
• The influx of cheap agricultural products from abroad reduced domestic agriculture's competitiveness, resulting in declining food self-sufficiency.

4. High Import Dependence for Specific Agricultural Products

• Rice is nearly 100% self-sufficient, but wheat stands at 15%, soybeans at 6%, and oils/fats at 14%—extremely low levels (FY2022). These items are indispensable to Japanese food culture, in bread, noodles, soy sauce, and cooking oil, and depend heavily on imports.

These factors interact complexly, explaining Japan's persistently low food self-sufficiency. Excessive reliance on food imports heightens vulnerability to international conditions and natural disasters.

Japan's food self-sufficiency rate (primarily on a calorie-supply basis) has declined in the postwar period and remains at a low level of 37-40% in recent years, due to dietary changes, agricultural policy directions, and national land constraints. Starting high at around 88% immediately after the war (FY1946), it gradually declined from 79% in 1960, and has remained below 40% since the 2000s (recent data shows approximately 37%).

1. Rapid Dietary Changes (Westernization and Diversification)

This is the primary factor. During Japan's period of rapid economic growth, eating patterns shifted dramatically from rice-centered traditional food to a Western diet heavy in meat, dairy, oils, and wheat products.

• Per-capita rice consumption peaked at about 118 kg/year in the 1960s but has declined to roughly 50 kg today—less than half.
• Meanwhile, consumption of livestock products (meat and dairy) and oils increased dramatically. Domestic production requires massive quantities of feed grains (corn) and soybeans, which Japan produces minimally.
• As a result, self-sufficiency plummeted from 79% to around 55% between 1960 and 1973 alone, continuing this trend thereafter.

While dietary diversification enhanced living standards, reduced demand for domestically-sourced rice combined with increased demand for import-dependent items caused self-sufficiency to fall.

2. Agricultural Policy and Economic Prioritization

• High-price rice policy and production adjustment: To support farm income, rice prices were kept high, leading to rice overproduction. The government responded with production adjustment (acreage reduction). Meanwhile, production of other crops like wheat and soybeans declined, creating import dependence.
• Industrialization-first development: Postwar Japan accelerated labor shifts from agriculture to manufacturing and services, reducing agricultural workers and causing aging. Part-time farming increased while land utilization fell.
• Trade liberalization and yen appreciation: From the 1980s onward, yen appreciation made imported agricultural products cheaper, and consumers increasingly chose imports.

These policies supported short-term farm protection and economic growth but became long-term drivers of declining food self-sufficiency.

3. Land and Geographic Constraints

Approximately 70% of Japan is mountainous, with limited flat, agriculturally suitable land. High population density and urbanization have further reduced arable area, creating physical limits to production expansion. The climate is also vulnerable to change and adverse weather.

Supplementary Note: Self-Sufficiency Metrics

• Calorie basis: 37-40%, appearing lower (includes imported feed).
• Production value basis: Around 66%, comparatively higher.

The government targets 45% on a calorie basis and 75% on a value basis by 2030, but achievement is deemed difficult.

In summary, postwar "pursuit of affluence" and the "industrial-priority growth model" drove Japan's food self-sufficiency decline. Since land conditions are difficult to change, policy and dietary reassessment are considered key factors going forward.