What Japanese households actually eat

There are two ways to find out what a country eats. You can ask what it is famous for, or you can look inside its shopping baskets. The answers are not always the same.

Japan is unusual in that the second answer is public. The Statistics Bureau of Japan runs the Family Income and Expenditure Survey, which records how much of each food an average household buys in a year, city by city. Not what restaurants serve, not what tourists order — what people carry home.

Where the numbers go strange

Measured against the national average, a few cities are far outside the normal range.

• Freshwater clams, 10.28× — Matsue, Shimane Prefecture. 2,055g a year, against a national average of 200g
• Peaches, 8.91× — Fukushima. 9,358g, against 1,050g
• Crab, 7.77× — Tottori. 2,760g, against 355g
• Scallops, 5.85× — Aomori. 1,779g, against 304g
• Bonito, 4.31× — Kochi. 3,574g, against 829g

Ten times the national average is a strange number. Households across Japan buy 200g of freshwater clams in a year. Households in Matsue buy two kilograms. That is not a delicacy anyone is saving for a special occasion. That is a soup somebody makes on a Tuesday.

Now add the dishes

Separately, the Ministry of Agriculture, Forestry and Fisheries (MAFF) maintains a national record of regional dishes — 1,365 of them, each tied to a prefecture, with its ingredients and the occasions it is eaten.

Shimane's entry includes shijimi clam soup, made with clams from Lake Shinji. Kochi's includes katsuo no tataki, seared bonito. In both cases the dish in the record and the spike in the shopping data point at the same thing. Tradition and daily life agree.

That is the expected result. The interesting one is where they disagree.

The same soup, in a prefecture that stopped buying it

MAFF's record lists shijimi clam soup in Shiga Prefecture as well, made with Seta shijimi from Lake Biwa, described as eaten throughout the prefecture.

But in the household data, Otsu — Shiga's capital — buys 92g of freshwater clams a year. That is 0.46× the national average, 46th out of the 52 cities surveyed. One twenty-second of what Matsue buys.

The dish is on the national list of living regional cuisine. The households of that prefecture buy less than half of what the average Japanese household buys.

The reason is in the same document

MAFF's own descriptions explain it, and the explanation is a single sentence of biology.

• Shiga's soup uses Seta shijimi, harvested from March to April. It comes into season in early spring
• Shimane's soup uses Yamato shijimi, which can be harvested year-round, and MAFF notes it is eaten as an everyday food

One clam has a season of two months. The other has no season at all. That difference — nothing to do with taste, or pride, or history — is what shows up in the annual shopping figures.

Shiga's shijimi soup is a dish people make in spring. Shimane's is a dish people make. The same name covers two entirely different places in daily life.

Why this is worth knowing

If you are trying to eat well in Japan, "famous local specialty" is a weaker signal than it looks. It tells you what a place is known for, which is often what it once had in abundance, or what sells well to visitors.

The shopping data tells you something narrower and more useful: what the people living there are still buying, in quantity, this year.

• A high multiple usually means the food is genuinely everyday there — not a performance for visitors
• A dish in the tradition record with no matching spike may be seasonal, ceremonial, or simply passing out of use
• And a high multiple with no fame at all is the most interesting case. Mito buys 3.61× the national average of freshwater clams. Almost nobody outside Ibaraki associates the two

Where to look

Every prefecture on this site has its own page showing what its capital buys, and by what multiple, with the regional dishes recorded for that prefecture alongside. If you are heading somewhere specific, that page is the fastest way to see what the locals are actually eating.

Browse all 47 prefectures · What's in season now

Sources: Statistics Bureau of Japan, "Family Income and Expenditure Survey" — rankings by prefectural capital and designated city, 2023–2025 average. Regional dishes from the Ministry of Agriculture, Forestry and Fisheries, "Our Regional Cuisines." Compiled and processed by Japan's Best Eats Rankings.