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Food · Supply

MREs (meals, ready-to-eat): contents, heating, shelf life

What comes in an MRE, how the flameless ration heater works, calories per meal, and shelf life by storage temperature.

Quick facts

Calories
About 1,200 to 1,300 per meal
Shelf life, typical
Around 3 to 5 years
At 70°F
About 8 years at 70°F on the older chart; 7 years or more at 60°F
At 90°F
Approximately 55 months
At 100°F
Around 22 months
Heating time
About 10 to 15 minutes in the flameless ration heater
Meals, Ready-to-Eat (MREs)

are self-contained, individual field rations in lightweight packaging used by the military and great for emergency scenarios. They are designed to be easily transportable and provide a balanced diet for soldiers in the field. MREs are known for their durability and ability to withstand harsh conditions, making them suitable for a variety of environments.

MRE Main Course
Treat MRE

What's Typically Found in MREs

1Main CourseThis is typically a protein-rich dish like beef stew, chicken, pasta, or vegetarian options.
2Side DishOften includes rice, corn, fruit, or mashed potatoes.
3Bread or CrackerUsually accompanied by a spread like peanut butter, jelly, or cheese spread.
4DessertCommonly a cookie, brownie, or other sweet items.
5SnacksNuts, dried fruits, or snack bars.
6BeveragesPowdered drink mixes that can be added to water, including coffee, tea, or sports drinks.
7Condiments and AccessoriesSalt, pepper, sugar, creamer, and sometimes hot sauce. Utensils and napkins are also included.
8Flameless Ration Heater (FRH)A key component for heating the meal.
MRE Pack
MRE Cakes

SEARCH MREs on AMAZON

Heating Up MREs

MREs can be eaten cold if necessary, but they usually come with a Flameless Ration Heater (FRH) for heating:

1Activation of FRHThe FRH is a bag that contains a magnesium-based, water-activated chemical heater. To activate it, a small amount of water is added to the bag, which then chemically reacts with the magnesium, producing heat.
2Heating the FoodThe main meal pouch is placed into the FRH bag. The chemical reaction generates enough heat to warm the meal thoroughly in about 10 to 15 minutes.
3Safety PrecautionsThe heater gives off hydrogen gas as it works, so use it in a ventilated space and away from flames, sparks and smoking. The bag and the water get hot enough to scald. Do not drink the heater water.

Nutritional Content and Shelf Life

CaloriesMREs are calorie-dense, typically containing about 1,200 to 1,300 calories per meal to meet the high energy demands of active military personnel.
NutritionThey are designed to provide a balanced marcronutrient profile with carbohydrates, protein, fat, vitamins, and minerals.
Shelf LifeMREs have a long shelf life, usually around 3 to 5 years, but this can vary based on storage conditions.

MRE Shelf Life by Storage Temperature

Shelf Life of MREs
  1. 120°F (49°C):
    • Lifespan: Approximately 1 month.
    • Context: Such high temperatures can rapidly degrade the quality of MREs, affecting taste, texture, and nutritional content.
  2. 110°F (43°C):
    • Lifespan: About 5 months.
    • Context: Still quite warm, this temperature significantly shortens the MRE's lifespan.
  3. 100°F (38°C):
    • Lifespan: Around 22 months.
    • Context: This is closer to conditions in hot climates or non-climate-controlled storage areas.
  4. 90°F (32°C):
    • Lifespan: Approximately 55 months (about 4.5 years).
    • Context: This is a common maximum storage temperature recommended for maintaining reasonable shelf life.
  5. 80°F (27°C):
    • Lifespan: 3 years is the official rating. The older Natick chart projected about 6 years.
    • Context: This is the reference temperature the military uses for its 3 year rating. Cooler is better.
  6. 70°F (21°C):
    • Lifespan: About 8 years (100 months) on the older chart. At 60°F, 7 years or more per USDA.
    • Context: These are optimal conditions that can significantly extend the shelf life of MREs, though such controlled conditions may not always be practical.
MRE Date Codes

Additional Considerations

Quality vs. SafetyWhile the taste and nutritional value of MREs may decline over time, they can remain safe to eat beyond these periods if the packaging is intact and they have been stored properly.
Visual InspectionBefore consuming an MRE that has been stored for a long period, it's wise to inspect the packaging for any signs of damage or spoilage.
Manufacturer GuidelinesAlways refer to the manufacturer's guidelines for the most accurate shelf life information, as formulations and packaging technology can vary.

Variations and Customizations

  • Special Diets: There are vegetarian, kosher, and halal options to cater to different dietary requirements.
  • International Variants: Many countries have their own versions of MREs, tailored to their military's dietary preferences and nutritional guidelines.

Questions this answers

Tap a question for the short answer.

How long do mres last?

MREs usually last around 3 to 5 years, depending on storage conditions. The official rating is 3 years at 80°F. The older Natick chart projected about 6 years at 80°F and about 8 years at 70°F. Heat shortens that fast: approximately 1 month at 120°F.

How does storage temperature affect mre shelf life?

Heat shortens shelf life sharply. Expect approximately 1 month at 120°F, about 5 months at 110°F, around 22 months at 100°F, approximately 55 months at 90°F, about 6 years at 80°F and about 8 years at 70°F on the older Natick chart. The official rating is 3 years at 80°F.

How do I heat an mre?

Use the flameless ration heater that comes with the meal. Add a small amount of water to the bag to activate the magnesium-based heater, put the main meal pouch inside, and wait about 10 to 15 minutes. Do it in a well-ventilated area and handle it carefully, since it gets quite hot.

How many calories are in an mre?

An MRE typically contains about 1,200 to 1,300 calories per meal, built to meet the high energy demands of active military personnel, with a balance of carbohydrates, protein, fat, vitamins, and minerals.

What comes in an mre?

A typical MRE has a main course, a side dish, bread or crackers with a spread, a dessert, snacks, a powdered drink mix, condiments, utensils and napkins, and a flameless ration heater for warming the meal.

Can I eat an expired mre?

Taste and nutritional value decline over time, but MREs can remain safe to eat beyond their rated periods if the packaging is intact and they were stored properly. Inspect the packaging for damage or spoilage before eating one that has been stored a long time.

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