Malnutrition Often Goes Unnoticed Until Damage Is Severe, Experts Warn

Malnutrition is linked to an estimated 50,000 deaths a year in Germany, and about 2 billion people worldwide suffer hidden hunger.
By the time symptoms appear, it's already too late.
Nutrition expert Matthias Pirlich on why deficiencies like B12 and vitamin D go unnoticed.
Mark

Why does this story hit differently from the usual hunger coverage?

Mimi

Because the people affected can look fine. Pirlich says a vitamin D or B12 deficiency can run for months with no symptoms, and by the time nerve damage appears it's too late.

Mark

And that's where the 50,000 deaths a year in Germany comes in?

Mimi

That's the DGEM's estimate of deaths attributable to malnutrition, yes.

Luke

I'd keep that label in view. It's one society's estimate, and the piece doesn't explain how they reached it, so I wouldn't treat it as a counted figure.

Mark

What about the hospital numbers?

Mimi

About 30% of inpatients are affected or at risk, but only about 1% are screened and treated. That gap is the heart of it.

Luke

Same caution: the 30% is also a DGEM estimate. The 1% comes from health insurance data, so the two figures come from different sources and may not measure exactly the same thing.

Mark

Is the plan to fix it concrete?

Mimi

A road map is due by 2027, copying the Dutch model of checking every patient on admission.

Luke

But it's a road map being developed, not a funded program. We don't know what it will require or cost, or whether it will work.

Mark

Anything the data leaves open?

Luke

Whether lower micronutrient levels in modern crops affect health. The article says that's debated, so it stays unresolved.

  • Roughly 50,000 deaths a year in Germany are linked to malnutrition, yet the danger rarely announces itself.
  • A vitamin D or B12 deficiency can quietly grow for months, and by the time nerves are hurt, the damage may be hard to undo.
  • Hospitals, where about 30% of patients are at risk, screen only about 1%, leaving the gap wide open at the moment it matters most.
  • A road map modeled on the Dutch approach, universal screening on admission, is being drafted and is due by 2027.
  • Poverty, depression, multiple medications and living alone push people toward diets that fill but do not nourish, and the path forward still depends on wider access to healthy food.

Tens of thousands of people in Germany are estimated to die each year in ways tied to malnutrition, a harm that tends to hide itself until it has already done its work. The German Society for Nutritional Medicine places the toll near 50,000, and the quiet nature of the problem is what makes it so difficult to answer. Deficiencies that can sit unnoticed for months, and that reveal themselves only as nerve damage or failing strength, ask a society to look more carefully at what its people eat, what they lack, and who is left to eat alone.

The German Society for Nutritional Medicine estimates that around 50,000 deaths a year in Germany can be linked to malnutrition. The figure is troubling precisely because the condition gives little warning. A person can carry a serious vitamin D or B12 deficiency for months without feeling anything, and when nerve damage finally appears, numbness, weakness or even paralysis may already be advancing.

Matthias Pirlich, a nutrition expert and former DGEM vice president, explains that malnutrition is not only a matter of not eating enough. A diet can be full of calories and still lack vitamins and minerals such as iron, iodine and zinc, which the body cannot produce on its own. Worldwide, around 2 billion people live with this hidden hunger. Wealthy countries are not spared: about a third of Germans had too little vitamin D in 2017, and a third also lacked sufficient iodine.

The causes are often human and social. Fast food and refined bread and rice fill the stomach while offering little nourishment. Poverty pushes households toward cheap, energy-dense food. Depression can steal appetite and the will to look after oneself. Older adults, people living alone and those taking many medications are especially vulnerable, and chronic illnesses of the gut or liver can block nutrients from being absorbed.

Nowhere is the gap more visible than in hospitals. Around 30% of inpatients are affected by or at risk of malnutrition, yet only about 1% are screened and treated. Their conditions can worsen during a stay, bringing complications, slower recovery and higher costs.

A road map due by 2027, modeled on the Dutch system of checking every patient on admission, is now being drafted. Pirlich would extend screening to outpatient care for those with chronic illness and older adults, and he urges wider access to healthy food, including free school meals. For everyone else, his advice is a varied, largely plant-based diet, gently cooked vegetables and a colorful plate, along with a blood test when in doubt.

Some 50,000 deaths a year in Germany can be attributed to malnutrition, according to the German Society for Nutritional Medicine, known as DGEM. The figure is the society's estimate. It points to a problem that tends to stay out of sight until the damage is already done.

Matthias Pirlich, an internal medicine specialist and nutrition expert who once served as DGEM vice president, describes how quietly it works. In most cases, he says, you notice nothing at first. A person can have a severe vitamin D deficiency for months without a single symptom, and the same goes for vitamin B12. By the time symptoms such as nerve damage show up, Pirlich warns, it is already too late. A long-term B12 deficiency can injure the spinal cord, causing numbness in the limbs, muscle weakness or even paralysis. Less commonly, it can damage the brain, leading to memory loss and mental health problems.

The terms matter here. Undernutrition means the body takes in less food than it needs over a long period. A recent report from the FAO estimates that about 645 million people worldwide live with chronic undernutrition. Malnutrition, by contrast, can occur even when calorie intake is enough, if the diet lacks certain macronutrients or micronutrients such as vitamins, calcium, magnesium, iron, iodine and zinc. The body cannot make micronutrients itself. About 2 billion people worldwide experience this so-called hidden hunger, most of them in the Global South.

Industrialized countries are not exempt. One study found that just under three-quarters of the US population fell short of the recommended daily vitamin D intake between 2007 and 2010, and more than two-thirds missed the target for vitamin E. In Germany, about one-third of people had a vitamin D deficiency in 2017, according to the German Nutrition Society. That can bring bone, joint and muscle pain and a higher risk of falls and fractures. About a third of Germans also took in too little iodine, which the body needs for thyroid hormones and which a baby needs for proper brain and nervous system development during pregnancy. Some farming methods aimed at long shelf life or high yields have reduced the micronutrient content of fruit, vegetables and grains in places, though whether that affects human health is debated.

The causes are varied. Fast food, highly processed products, white bread and white rice fill the stomach but offer few micronutrients. Poverty often drives such diets, whether in the Global South, where people may afford only staples like flour or rice, or in Germany, where one study found that households at risk of poverty eat more foods low in nutrients and high in calories. Depression is another factor. Pirlich told DW that people often lose their appetite and neglect self-care, ending up with a very unbalanced diet. His research shows older adults and people living alone often develop malnutrition, and the risk rises with the number of medications taken. Illnesses such as Crohn's disease, celiac disease, liver disease and cancer can also impair how the intestines absorb or use nutrients.

Hospitals are where the gap is most visible. The DGEM estimates that about 30% of inpatients in Germany are affected by or at risk of malnutrition, yet health insurance data shows only about 1% are screened and treated. Malnutrition often worsens during a hospital stay, which can bring complications, slower recovery, longer stays and higher mortality, and costs the health system billions each year.

German policymakers and medical associations are now drafting a plan to change that. The road map is due by 2027 and is modeled on the Dutch approach, in which every patient is checked for nutritional deficiencies on admission. Pirlich would extend screening to outpatient clinics for at-risk groups, namely people with chronic and serious illnesses and, above all, older adults. To tackle poverty-related malnutrition, he suggests wider access to healthy food, with free school meals as one example.

For individuals, his advice is a varied, largely plant-based diet, and the more colorful the plate, the better. Vegetables should be cooked gently, since overheating and long warm-keeping destroy vitamins, and seasonal, regional produce loses less to storage. Even careful eaters can still develop deficiencies. A blood test can settle the question, and supplements may help fill the gap.

In most cases, you don't notice anything at first; a severe vitamin D deficiency can go months without symptoms, and the same applies to B12.
— Matthias Pirlich, nutrition expert and former DGEM vice president
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