PEM and Micronutrient Deficiencies in Disaster Zones

When a disaster strikes-be it a flood, an earthquake, or a conflict-the first images we see are often of destroyed homes and displaced families. The immediate, urgent needs are clear: shelter, clean water, and medical care. But simmering just beneath this initial chaos is a quieter, more insidious crisis: malnutrition. In an emergency, normal food supplies are shattered. Farms are destroyed, markets close, and supply chains break. People are often forced to survive on whatever they can get, which is rarely enough and almost never nutritionally complete. This isn’t just about hunger; it’s about the rapid deterioration of the body’s essential systems. The two most formidable threats in these zones are protein-energy malnutrition, the severe wasting of the body itself, and micronutrient deficiencies, the hidden hunger for vitamins and minerals that can lead to blindness, anemia, and death.

The two faces of starvation: understanding protein-energy malnutrition 🔗

Protein-Energy Malnutrition (PEM) is the most devastating form of malnutrition and the most visible consequence of famine. It occurs when the body is deprived of the fundamental building blocks-calories from carbohydrates and fats, and protein for cellular repair. In emergency settings, the diet often shifts to a single staple, like maize or rice, which can sustain life for a short time but cannot support health. The body, desperate for fuel, begins to consume itself. This devastating condition primarily manifests in two distinct, though often overlapping, forms: marasmus and kwashiorkor.

Marasmus: the body in survival mode 🔗

Marasmus is a severe form of “wasting” caused by an overall deficiency of energy. This is a profound lack of calories from all sources-protein, carbohydrates, and fats. It often develops in infants and young children who are not breastfed or who receive diluted, unsanitary milk formulas, or in adults during periods of extreme famine. The body initiates a desperate survival sequence, slowing metabolism and breaking down its own tissues for fuel. First, it burns through fat reserves, and then it begins to consume muscle.

The symptoms are stark and heartbreaking:

• Severe wasting: The child or adult appears emaciated, like “skin and bones.” Ribs, shoulders, and vertebrae are prominent.
• “Old man” face: The loss of fat in the cheeks makes the face look gaunt and aged.
• Alert but irritable: Unlike the lethargy of kwashiorkor, individuals with marasmus are often restless and visibly hungry.
• No edema: There is no swelling, as the body’s tissues are shrinking.

Treating marasmus is a delicate process known as refeeding. Giving a large, normal meal to a starved person can be fatal, triggering a shock to the system called “refeeding syndrome.” Instead, treatment is done in phases, often starting with specialized therapeutic milk formulas like F-75, which are low in protein and fat but provide enough energy and electrolytes to stabilize the metabolism. Once stabilized, the patient is moved to a richer, energy-dense food, such as Ready-to-Use Therapeutic Food (RUTF). RUTF is a fortified peanut-based paste that is calorie-rich, requires no mixing with potentially contaminated water, and has revolutionized the community-based treatment of malnutrition.

Kwashiorkor: the deceptive swelling 🔗

If marasmus is a visible wasting, kwashiorkor is a deceptive, hidden starvation. This condition is classically associated with a diet that might have *some* calories (usually from carbohydrates like yams or rice) but is critically deficient in protein. It often appears in a child who has been weaned too early onto a low-protein staple, perhaps because a new baby has arrived. The name itself is derived from a Ghanaian word meaning “the sickness the older child gets when the new baby comes.”

The defining symptom of kwashiorkor is edema, or swelling. Think of protein, specifically albumin, as a sponge in your bloodstream that keeps water inside the blood vessels. Without enough protein, the “sponge” fails, and water leaks out into the surrounding tissues. This fluid accumulation causes the feet and legs to swell, and in severe cases, the hands, face, and belly (distended abdomen). This swelling is deceptive; it masks the severe muscle wasting happening underneath, and a child with kwashiorkor may not look severely underweight.

Other key symptoms include:

• Edema: Swelling that starts in the feet and moves up the body.
• Skin changes: Flaky, peeling skin (flaky-paint dermatosis) and skin lesions.
• Hair changes: Hair becomes brittle, sparse, and may lose its color, sometimes turning reddish-yellow (flag sign).
• Lethargy and apathy: The child is often miserable, withdrawn, and has no appetite.
• Fatty liver: Without protein to transport fat, it accumulates in the liver, enlarging it.

Treatment for kwashiorkor is even more delicate than for marasmus because the body’s metabolic systems are severely compromised. It follows a similar phased approach with therapeutic milks (F-75, then F-100) to slowly reintroduce nutrients, correct electrolyte imbalances, and manage infections, which are almost always present.

Marasmic-kwashiorkor: the combined crisis 🔗

It is also common for a child to present with a combination of both conditions. A child with marasmic-kwashiorkor will show signs of severe wasting (like marasmus) while also having edema (like kwashiorkor). This mixed form represents a critical and complex nutritional emergency, requiring intensive, specialized medical care to manage the severe metabolic disturbances.

The invisible epidemic: micronutrient deficiencies 🔗

While PEM is a catastrophic failure of energy and protein, micronutrient deficiencies are a quieter, though no less deadly, crisis. These “hidden hungers” occur when the body is deprived of essential vitamins and minerals. In an emergency, food aid often consists of staples like fortified flour, rice, and oil. While these save lives from starvation, they may lack the full spectrum of nutrients. Humanitarian agencies work to provide fortified foods, but gaps are common. Three deficiencies are particularly notorious in emergency zones.

Anemia (iron deficiency) 🔗

Anemia, primarily caused by iron deficiency, is the most widespread micronutrient deficiency in the world, and it’s massively exacerbated in emergencies. Iron is the crucial component of hemoglobin, the protein in red blood cells that transports oxygen from your lungs to the rest of your body. Without enough iron, your body is effectively suffocating on a cellular level.

In emergencies, diets often lack iron-rich foods like meat, poultry, and dark leafy greens. This leads to widespread fatigue, weakness, shortness of breath, and dizziness. For children, it permanently impairs cognitive development and physical growth. For pregnant women, it’s a leading cause of maternal death and low birth weight. The response involves distributing iron-folate supplements to pregnant women and children, and providing fortified blended foods, like Corn-Soya Blend (CSB), in the general food ration.

Xerophthalmia (vitamin A deficiency) 🔗

Vitamin A is essential for two primary things: a healthy immune system and vision. In disaster zones, where diets lack fruits, vegetables, and dairy, Vitamin A Deficiency (VAD) can spread rapidly. Its impact on the immune system is devastating, turning common childhood illnesses like measles into a deadly disease.

Its effect on vision is just as tragic. VAD first manifests as night blindness. As it progresses, it causes the eyes to become dangerously dry (xerophthalmia), leading to corneal ulcers, scarring, and, ultimately, irreversible blindness. Because VAD is so deadly, its prevention is a top priority in emergencies. High-dose Vitamin A supplements are often distributed to all children under five during mass vaccination campaigns-a simple, low-cost intervention that saves both sight and lives.

Beriberi (thiamine deficiency) 🔗

Beriberi is a disease caused by a lack of thiamine (Vitamin B1), which is vital for converting carbohydrates into energy and for proper nerve function. This disease is a classic, tragic side effect of food aid that is not properly managed. It occurs in populations that become almost entirely dependent on a single staple: polished white rice. The process of polishing rice removes the outer husk, or bran, which is where the thiamine is.

There are two main forms: “dry beriberi” attacks the nervous system, causing numbness in the extremities, confusion, and paralysis. “Wet beriberi” attacks the cardiovascular system, leading to edema, a rapid heart rate, and, often, fatal heart failure. A particularly acute form in infants can cause death within hours. The solution is straightforward: ensure that any rice distributed in food aid is fortified with thamine, or distribute thiamine supplements alongside it.

Prevention: the only humane strategy 🔗

Treating acute malnutrition is a life-saving, last-ditch effort. The real goal is always prevention. In emergency response, this means moving beyond just delivering calories and focusing on delivering nutrition from day one.

• Diversified food baskets: Humanitarian organizations now strive to include a “food basket” that contains not just a staple (rice, maize), but also a pulse (lentils, beans) for protein, fortified vegetable oil for fat and vitamins, and fortified blended foods.
• Targeted supplementation: This involves rapid nutritional assessments to identify the specific risks in a population (e.g., Vitamin A or iron) and launching targeted supplementation campaigns for the most vulnerable: children, pregnant women, and breastfeeding mothers.
• Promoting local resilience: In long-term refugee or displacement situations, promoting community and home gardens is a vital step. Providing seeds, tools, and education for growing nutrient-dense foods (like leafy greens and legumes) empowers families, restores dietary diversity, and builds a sustainable defense against malnutrition long after the immediate crisis has passed.

What do you think? When you consider the complex differences between marasmus and kwashiorkor, how does it change your perspective on what “food aid” should actually consist of? Given the challenges in disaster zones, what do you believe is the single biggest barrier to preventing hidden hunger?

References

1. https://www.unicef.org/innovation/RUTF
2. https://www.who.int/news-room/fact-sheets/detail/malnutrition
3. https://www.wfp.org/nutrition-emergencies
4. https://www.msf.org/treating-malnutrition