Japan's Midsummer Eel Day: Five Stamina Foods for Kids When Eel Isn't on the Menu

First, What Is Eel Day?

Doyo no Ushi no Hi — the midsummer "Day of the Ox" — falls in late July (July 26 in 2026). The tradition dates back centuries: eat rich, nourishing eel at the peak of summer heat, and you will hold your stamina through the exhausting weeks ahead. It is Japan's most delicious piece of seasonal health folklore, and unusually for folklore, the nutrition checks out — grilled eel really is dense in vitamins B1, B2, D, and E, plus iron, DHA, EPA, and taurine.

But here is the liberating insight, useful whether you are keeping a Japanese tradition alive abroad or just borrowing a smart seasonal habit: no single food has a monopoly on those nutrients. Instead of one heroic (and pricey) eel, think in roles — "this food covers B1, this one covers iron, this one covers DHA" — and combine everyday ingredients.

Two of those roles matter most for kids in summer. Vitamin B1 (thiamin) is the coenzyme that converts carbohydrates into energy; run low, and you get the classic "eating plenty but still wiped out" summer slump (Sriram et al., 2012). And iron status affects children's cognition and attention span — iron deficiency in early childhood has been linked to lasting developmental differences (Lozoff et al., 1991) — which makes summer, with its sweat losses and appetite dips, a season to mind it. More on that in iron deficiency and kids' focus.

Eel vs. the Alternatives: The Numbers

Values per 100 g (3.5 oz), from Japan's Standard Tables of Food Composition (MEXT, 2020, 8th revision); figures vary with preparation.

• Grilled eel (the benchmark): B1 0.75 mg · iron 0.5 mg · protein 23.0 g
• Pork loin, thin-sliced: B1 0.69 mg · iron 0.3 mg · protein 19.3 g — the B1 near-equal
• Pork liver: B1 0.34 mg · iron 13.0 mg · protein 20.4 g — the iron champion (26× eel)
• Canned mackerel or sardines (water-packed): B1 0.13 mg · iron ~1.7 mg · protein ~21 g — plus DHA, EPA, taurine
• Soybeans, boiled (and edamame): B1 0.22 mg · iron 2.2 mg · protein 14.8 g — the plant all-rounder
• Freeze-dried tofu (koya-dofu), rehydrated: iron 3.6 mg · protein 10.7 g — plant iron in disguise-friendly form

The Five Alternatives in Detail

1. Pork — the vitamin B1 near-equal

Pork loin's 0.69 mg of B1 per 100 g essentially matches eel's 0.75 mg, at a fraction of the cost and in forms kids already like. Bonus chemistry: allicin from onions and garlic supports thiamin absorption, so the classic pork-and-onion stir-fry is nutritionally smarter than it looks.

Kid-friendly ideas: lightly seasoned pork-and-onion stir-fry packed in small portions; steamed mini pork meatballs; thin pork slices rolled in lettuce with a citrus dip.

2. Liver pâté — the iron champion, in stealth mode

Pork liver delivers about 13 mg of iron per 100 g — twenty-six times eel. The smell and texture that make kids balk disappear almost completely in pâté form: sauté with onion, blend with a little butter, spread on crackers. Liver is also rich in vitamin A, which is exactly why moderation matters — small portions, once or twice a week, to avoid excess vitamin A.

Kid-friendly ideas: liver pâté on crackers; mini burgers with 20% liver blended into the ground meat; a sweet-savory liver and carrot sauté.

3. Canned mackerel or sardines — eel's oily-fish cousins

Like eel, these are oily fish carrying DHA, EPA, and taurine; a typical can supplies a multi-day dose of omega-3s with zero cooking. Water-packed versions skip added sugars. If the fishy edge puts your child off, curry powder, tomato, or a miso-mayo blend tames it reliably.

Kid-friendly ideas: flaked sardine and onion rice balls; sardine-tomato-cheese mini toasts; mackerel rice cooked pilaf-style, shaped into small onigiri.

4. Soybeans and edamame — the plant all-rounder

Boiled soybeans cover B1, non-heme iron, and protein at once, and edamame is the single easiest summer form — kids treat pod-popping as a game, not a nutrition intervention. Pair with vitamin C (strawberries, orange segments, bell pepper strips) to boost non-heme iron absorption; the pairing science is in our iron absorption pairing guide. Full edamame playbook: the edamame snack guide.

Kid-friendly ideas: salted edamame in the pod; a soy-puff and dark chocolate snack bar with banana; chilled tofu-edamame soup for the hottest days.

5. Freeze-dried tofu (koya-dofu) — plant iron that hides in plain sight

This traditional freeze-dried tofu — available at Japanese and Asian groceries in the U.S. — concentrates iron (about 7 mg/100 g dry, 3.6 mg rehydrated), calcium, and protein. Its superpower for selective eaters: it soaks up whatever broth it sits in and reads as "just part of the soup." A 20–30 g snack portion covers a meaningful share of a toddler's daily iron target.

Kid-friendly ideas: simmered in mild dashi, portioned small; diced fine into seasoned rice; baked "no-fry karaage" nuggets.

Allergy Swaps

Build the same nutrient coverage around any allergy by shuffling the roles:

• Fish allergy: skip sardines/mackerel → lean on pork, soy foods, eggs, and chicken.
• Soy allergy: skip soybeans, tofu, and edamame → lean on pork, canned fish, eggs, and lean beef.
• Pork-free households: lean beef, canned fish, soy foods, and eggs cover B1, iron, and protein together.

For complex allergy combinations, plan snacks with your pediatrician or a registered dietitian rather than solo.

Keeping the Spirit of the Tradition

The deepest point of Eel Day was never the eel — it is the idea of marking the hardest stretch of summer with deliberate nourishment. That idea travels anywhere: pick a late-July day, tell your kids the story of the Day of the Ox, and serve a "stamina snack" you chose on purpose. Pair it with smart fluids on hot afternoons — see summer heat and stamina recovery snacks and summer hydration for kids — and you have imported the useful core of a 200-year-old tradition without a single eel.

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Frequently Asked Questions

What exactly is Doyo no Ushi?

The midsummer "Day of the Ox" in Japan's traditional calendar — July 26 in 2026 — when families eat grilled eel for stamina against summer fatigue. The custom was popularized in the Edo period and remains one of Japan's favorite food holidays.

Is pork really comparable to eel for B1?

Per 100 g, pork loin's 0.69 mg of thiamin nearly matches grilled eel's 0.75 mg — and pork wins easily on price, availability, and kid acceptance. Cook it with onions or garlic for better absorption.

From what age can kids have canned fish?

Water-packed canned fish generally works from around age 1. For children under 3, flake it and check for small bones. It blends easily into rice, toast, and pasta formats.

Why the caution about liver?

Liver's vitamin A is a benefit in small doses and a concern in large ones. Keep it to small portions once or twice weekly for kids, and pâté is the most accepted format by far.

References

• Lozoff, B., Jimenez, E., & Wolf, A. W. (1991). Long-term developmental outcome of infants with iron deficiency. New England Journal of Medicine, 325(10), 687–694. doi.org/10.1056/NEJM199109053251004
• Sriram, K., Manzanares, W., & Joseph, K. (2012). Thiamine in nutrition therapy. Nutrition in Clinical Practice, 27(1), 41–50. doi.org/10.1177/0884533611426149
• MEXT (Japan Ministry of Education, Culture, Sports, Science and Technology). Standard Tables of Food Composition in Japan, 2020 (8th revised edition). mext.go.jp

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