Nutrition Management in a Disaster | Nutrients That Run Short in Shelter Life and How to Address Them

April 7, 20262026年7月29日

Summary of this article

In shelter life after a disaster, nutrition falls seriously short—vitamin C at 20–30% of needs and dietary fiber at 20–30%. Shelter surveys after the Great East Japan Earthquake found meals were carbohydrate-centered with almost no vegetables offered, and after the Kumamoto Earthquake vegetables were unavailable for a week. This article covers the five nutrients most likely to run short and a household stockpile list for four people for three days that works dried vegetables into the side-dish category.

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Shelter Meals: “Anything Edible Will Do” Is a Dangerous Mindset

When an earthquake, typhoon, or other disaster strikes, the first thing on your mind is securing your safety. Meals tend to get pushed to the back burner. But as shelter life stretches to three days, then a week, the quality of your meals starts to weigh heavily on physical and mental health.

At shelters after the Great East Japan Earthquake, meals of nothing but rice balls and bread went on and on, and many evacuees suffered from vitamin deficiency and constipation. A Cabinet Office report states that about 70% of shelter meals were carbohydrate-centered, with almost no vegetables provided.

This article explains, for the disaster-conscious and for corporate disaster-preparedness staff, the nutrients that tend to run short in a disaster and how to choose stockpiled foods that make up for them. The goal is a state where, when it counts, you’re prepared on the nutrition front too.

What you will learn from this article

Data on Nutrients That Actually Ran Short in Disaster Shelter Life
What Symptoms Appear When Each Nutrient Runs Short
How to Choose Stockpiled Foods with Nutritional Balance in Mind
A Ready-to-Use Stockpile List (Household and Corporate)

The Reality of “Shelter Meals” Seen Through Past Earthquakes

Rather than ideals, let’s look back at what actually happened.

What Meals Were Like at Great East Japan Earthquake Shelters

From immediately after the disaster through about a week, most meals provided at shelters were rice balls, sweet rolls, and cup noodles. According to a survey by the Japan Dietetic Association, shelter meals reportedly had the following nutritional balance.

Nutrients	Fulfillment Rate Against Requirements	Vanished item
Energy (calories)	About 80–90%	Slightly short
Protein	About 60–70%	Short
Vitamin C	About 20–30%	Seriously short
Vitamin B1	About 40–50%	Short
Dietary fiber	About 20–30%	Seriously short
Calcium	About 30–40%	Short
Iron	About 40–50%	Short

Lessons from the Kumamoto Earthquake

In the Kumamoto Earthquake, nutritional support improved on the lessons of the Great East Japan Earthquake, yet vegetable supply was reportedly near zero for the first week after the disaster. Warm soups only started being served from day four onward.

Cases of Prolonged Shelter Life Are Increasing

In recent disasters, it’s no longer unusual for shelter life to run more than a month. In Typhoon Hagibis (Typhoon No. 19) in 2019, shelter life exceeded two months in some areas. The longer it lasts, the more serious the health impact of an unbalanced diet becomes.

5 Nutrients That Tend to Run Short in a Disaster

Before choosing stockpiled foods, it’s important to know what will run short.

ビタミンC：不足しやすい栄養素

ビタミンCは加工食品や長期保存食にはほとんど含まれません。避難所のような集団生活では、ビタミンCの確保が特に重要です。

生野菜や果物が手に入らない状況では、ビタミンCを含む備蓄食品やサプリメントが頼りになります。

B Vitamins: A Cause of Fatigue and Reduced Concentration

Vitamin B1 is a nutrient needed to convert carbohydrates into energy. Keeping up a carbohydrate-centered diet of rice balls and bread burns through large amounts of vitamin B1, making deficiency easy to fall into.

Typical deficiency symptoms are strong fatigue, irritability, and reduced concentration. Amid the cleanup and paperwork after a disaster, these symptoms greatly lower quality of life.

Dietary Fiber: Constipation Is the Enemy of Shelter Life

Frankly, constipation problems at shelters aren’t talked about much, but they’re serious. On top of a lack of dietary fiber, reduced water intake, poor toilet conditions, and stress pile up, and many evacuees suffer from constipation.

A shelter survey after the Kumamoto Earthquake found data showing that about half of evacuees experienced constipation. Constipation causes abdominal pain and loss of appetite, and becomes a factor that hinders the recovery of physical strength.

Protein: Reduced Muscle Strength and Slower Recovery

In shelter life, activity levels drop drastically while protein intake also declines. In older adults, one to two weeks of a low-protein diet can visibly reduce muscle strength, raising the risk of so-called disuse syndrome.

Protein Source	Ease of Obtaining as a Stockpile	Shelf stability
Canned goods (tuna, mackerel, etc.)	High	3–5 years
Protein bar	High	1 to 2 years
Soy products (dried)	Moderate	1 year or more
Retort foods	High	1–3 years
Freeze-dried foods	High	3–5 years

Calcium and Minerals: An Easily Overlooked Shortfall

A shortage of calcium or magnesium causes muscle stiffness and irritability. Japanese people tend to fall short on calcium even in normal times, and it becomes more serious in a disaster.

The komatsuna and spinach found in dried vegetables are also excellent sources of calcium. The strength is that you can take them in the same way as an everyday meal.

How to Choose Stockpiled Foods with Nutritional Balance in Mind

Move a step beyond “just buy some emergency food and you’re fine” and build a stockpile that keeps nutritional balance in mind.

Think of Stockpiled Foods in Five Categories

Category	Role	Examples of Stockpiled Foods
Staples (carbohydrates)	Energy source	Alpha rice, crackers, canned bread
Main dishes (protein)	Repairing and maintaining the body	Canned tuna, canned mackerel, boiled soybeans, protein bars
Side dishes (vitamins and minerals)	Maintaining immunity and managing condition	Dried vegetables, vegetable juice, dried fruit
Soups	Hydration and maintaining body temperature	Instant miso soup, soup
Supplementary foods	Nutritional supplementation	Multivitamins, nutritional jelly

Why Dried Vegetables Are the Best Answer for the “Side-Dish Category”

Among stockpiled foods, the options that can fill the side-dish (vegetable) position are limited. Vegetable juice is heavy and bulky. Canned vegetables split opinion on taste. Among these, dried vegetables are a stockpiled food with all three: lightweight, long shelf life, and retained nutritional value.

Agriture is a manufacturer that handles the drying of domestically grown vegetables in Kyoto. Low-temperature drying limits the loss of vitamins and minerals, and the ease of just rehydrating them in hot water is a defining feature. The variety is also broad—carrot, spinach, daikon, kabocha, burdock, and more.

Comparison with Vegetable Juice

“Why not just stockpile vegetable juice?” is a question we often hear. It’s certainly convenient, but comparing the two reveals the differences.

Comparison item	Dried vegetables	Vegetable Juice
Weight (equivalent to 100 g)	About 10 g	About 200 ml
Storage Space	Very compact	Bulky
Dietary fiber	Abundant (concentrated)	Little (removed during juicing)
Vitamins	Retained depending on the process	Some loss from heat sterilization
Preparation Method	Rehydrate in hot water	Drink as is
Satisfaction	Can be taken as a meal	Satisfaction as a beverage
Best-before date	6 months to over a year	6 months to 1 year

The key point is the large difference in dietary-fiber content. Because much of the dietary fiber is removed during the juicing process, dried vegetables are more effective as a countermeasure against constipation.

Stockpile Lists for Home and Company [Ready to Use]

Here are concrete stockpile lists, split into household and corporate versions.

Household: Family of Four x 3 Days

Item	Quantity	Nutritional Role
Drinking water (2 L)	18 bottles	Hydration
Alpha rice	24 servings	Energy source
Canned bread	8 cans	Energy source
Canned tuna / canned mackerel	12 cans	Protein
Dried vegetable mix	36 packs	Vitamins and dietary fiber
Instant miso soup	24 servings	Soup and salt
Dried fruit	4 packs	Vitamins and carbohydrates
Nutritional jelly	12 pieces	Vitamin supplementation
Multivitamins	1 bottle	Nutritional supplementation

Corporate: 50 Employees x 3 Days

Item	Quantity	Storage Space Guide
Drinking water (500 ml)	2,700 bottles	About 3 pallets
Alpha rice	300 servings	About 10 cardboard boxes
Crackers	150 packs	About 5 cardboard boxes
Canned goods (assorted)	150 cans	About 5 cardboard boxes
Dried vegetable mix	450 packs	About 3 cardboard boxes
Instant miso soup	300 servings	About 5 cardboard boxes
Nutritional supplements	150 pieces	About 2 cardboard boxes

Dried vegetables are lightweight, so even 450 packs fit into about 3 cardboard boxes. Compared with the space needed for drinking water, the storage efficiency is obvious.

Tips for Managing and Using Stockpiled Foods

Stockpiling isn’t “buy it and you’re done”—it requires ongoing management.

Putting the Rolling-Stock Method into Practice

The rolling-stock method means consuming stockpiled foods day to day and replenishing what you use. It prevents waste from expiration and keeps your stockpile fresh at all times.

Step	For Households	For Companies
Everyday Consumption	Use dried vegetables in miso soup once a week	Serve them in the staff cafeteria or office
Replenishment	Buy what you used once a month	Order quarterly
Inspection	Check expiration dates every six months	Update the management ledger once a month
Rotation	Start consuming three months before the expiration date	Hold a consumption event six months before expiration

Make Tasting Stockpiled Foods a Habit

Holding a tasting of stockpiled foods to coincide with Disaster Preparedness Day (September 1) or the company’s disaster drill is a recommended initiative. The discovery that “this is actually delicious” raises interest in stockpiling.

Agriture’s dried vegetables are of a quality usable not only for stockpiling but in everyday cooking. Since just adding them to miso soup or soup lets you get vegetables easily, they’re perfect for putting rolling stock into practice.

Don’t Forget Those Needing Special Consideration

Include stockpiles for those needing special consideration—older adults, infants, people with food allergies, those with chronic conditions—in your plan as well.

Older adults: soft, easy-to-eat foods and easy-to-swallow jelly foods
Infants: liquid milk and baby food (retort pouch)
Allergy-friendly: foods free of specified allergens (dried vegetables are easy to accommodate)
Diabetes, etc.: low-carbohydrate stockpiled foods

Summary

Nutrition management in a disaster is an important part of the preparedness that protects lives. “As long as we have rice balls, we’ll be fine” carries the risk of harming health when shelter life drags on.

Let’s recap the key points of this article.

Shelter meals are carbohydrate-centered, and you can get only 20–30% of the needed amount of vitamin C and dietary fiber
What runs especially short in a disaster is vitamin C, B vitamins, dietary fiber, protein, and calcium
Stockpiled foods should be built from five categories (staples, main dishes, side dishes, soups, supplementary foods)
As a side-dish-category stockpile, dried vegetables have all three: lightweight, long shelf life, and retained nutritional value
Consume and replenish day to day with the rolling-stock method to prevent expiration

The best time to review your stockpile is the moment you think of it. Start by checking whether “vegetables” are included in your home or office stockpile.

FAQ

Q1: Which nutrients are most likely to run short in a disaster?

Vitamin C and dietary fiber. Shelter meals tend to be carbohydrate-centered, and there is data showing you can take in only about 20–30% of the required amount of these two nutrients.

Q2: How long can dried vegetables be stored?

Generally, they keep for 6 months to over a year at room temperature. Storing them away from direct sunlight in a low-humidity place lets you maintain quality for a long time.

Q3: How can I prevent constipation during shelter life?

The basics are dietary-fiber intake and adequate hydration. Adding dried vegetables to miso soup or soup is an easy and effective way to take them in. On top of that, light exercise within your means also encourages bowel movement.

Q4: Is there anything to watch out for in stockpiles for children and older adults?

Children need more water per body weight than adults, so secure plenty of drinking water. For older adults, consider chewing and swallowing ability and prepare soft foods and jelly-type nutritional supplements. Dried vegetables soften when rehydrated in hot water, so they work for a wide range of ages.

Q5: Are there ways for a company to support employees’ household stockpiles?

Distributing disaster kits or subsidizing purchases is common. Some companies distribute Agriture dried-vegetable sets to all employees. As part of health management, supporting household stockpiles also helps boost employees’ sense of security and belonging.

Q6: Can stockpiled foods alone cover all the necessary nutrients?

The reality is that fully covering them is difficult. Vitamin C in particular is hard to obtain from long-life foods, so adding a multivitamin supplement to your stockpile gives peace of mind. Combining it with dried vegetables lets you cover a considerable range.

Author of this article

Rei Kojima Agriture CEO

CEO of Agriture Inc. Runs a contract processing and OEM business centered on dried vegetables and dried fruit. In partnership with farmers within Kyoto Prefecture, he pursues “sustainable food distribution” through the use of non-standard vegetables and support for sixth-industrialization. Drawing on extensive hands-on experience at manufacturing sites, he provides support that walks alongside every business considering OEM—from product planning and prototyping to small-lot handling, packaging design, and sales-channel development.

Nutrition Management in a Disaster | Nutrients That Run Short in Shelter Life and How to Address Them