A fatal case documented in 2026 shows that pellagra, a rare vitamin B3 deficiency disease, can develop in people with severe eating disorders like anorexia nervosa. According to Gram Research analysis, the woman had tryptophan levels at 16.1 nmol/mL—less than half the normal minimum—confirming severe nutritional deficiency. While pellagra is uncommon in developed countries today, people with eating disorders remain at serious risk for this life-threatening condition, which produces a distinctive rash pattern called “Casal’s necklace” on the neck and chest.
A tragic case reported in 2026 shows how a rare nutritional disease called pellagra can develop in people with severe eating disorders like anorexia nervosa. Pellagra happens when the body doesn’t get enough niacin (vitamin B3) or tryptophan, an amino acid the body needs. While pellagra is uncommon in wealthy countries today, people with eating disorders and those who drink heavily remain at serious risk. This case study emphasizes how important it is for doctors to recognize the warning signs of pellagra, including a distinctive rash pattern called “Casal’s necklace” that appears on the neck and chest. Understanding these signs could help save lives.
Key Statistics
A 2026 case report published in Forensic Science, Medicine, and Pathology documented a fatal pellagra case in a woman with anorexia nervosa who had tryptophan levels of 16.1 nmol/mL, less than half the normal minimum of 40.9-68 nmol/mL.
Autopsy findings in the 2026 pellagra case revealed characteristic skin changes under microscopic examination and severe emaciation, demonstrating how eating disorders can progress to life-threatening nutritional deficiencies.
The 2026 case report identified Russell’s sign (calluses on knuckles from self-induced vomiting) alongside Casal’s necklace rash, indicating multiple eating disorder behaviors contributing to fatal malnutrition.
The Quick Take
- What they studied: A fatal case of pellagra (a serious vitamin B3 deficiency disease) in a woman with anorexia nervosa, examining how the disease developed and what physical signs appeared
- Who participated: One adult woman with anorexia nervosa who developed pellagra; the case was studied through autopsy and laboratory testing after her death
- Key finding: The woman had extremely low tryptophan levels (16.1 nmol/mL compared to the normal range of 40.9-68 nmol/mL), confirming pellagra diagnosis and showing how severe nutritional deficiency can occur in eating disorders
- What it means for you: If you or someone you know has an eating disorder, it’s critical to get medical help early. Pellagra is preventable and treatable when caught, but severe malnutrition from eating disorders can cause life-threatening complications. This case shows why proper nutrition and professional treatment matter.
The Research Details
This is a case report, which means doctors documented one specific patient’s medical story in detail. When a patient died, doctors performed an autopsy (a medical examination after death) to understand what happened. They looked at the body’s tissues under a microscope and tested the blood to measure vitamin and amino acid levels. Case reports are important in medicine because they describe unusual or serious situations that doctors might not see often, helping other medical professionals recognize similar cases in the future.
The researchers examined physical signs on the body, including a distinctive rash pattern called “Casal’s necklace” that forms around the neck and upper chest. They also found other skin changes and signs of severe weight loss. The laboratory testing measured tryptophan, an amino acid that the body converts to niacin (vitamin B3), which is essential for survival.
This research approach matters because pellagra is so rare in developed countries that many modern doctors might not recognize it. By documenting this case thoroughly with autopsy findings and lab tests, doctors can educate other medical professionals about what to look for. This is especially important for people with eating disorders, who are at higher risk. The detailed documentation helps ensure that future cases might be caught earlier, potentially saving lives.
This is a single case report, which means it describes one person’s experience rather than comparing large groups. While case reports are less powerful than studies with many participants, they are valuable for documenting rare or serious conditions. The strength of this report comes from the thorough autopsy examination, microscopic tissue analysis, and specific blood test measurements that confirmed the diagnosis. The findings are reliable because they’re based on physical evidence and laboratory results rather than just symptoms.
What the Results Show
The woman showed classic signs of pellagra, including a distinctive rash pattern called “Casal’s necklace” that appeared on her neck and upper chest in a symmetric pattern. Autopsy revealed severe malnutrition and extreme weight loss. When doctors examined the skin tissue under a microscope, they found characteristic changes that confirmed pellagra. Most importantly, blood tests showed tryptophan levels at 16.1 nmol/mL, which is less than half the normal minimum of 40.9 nmol/mL. This extremely low level confirmed that her body was severely deficient in the amino acid needed to produce vitamin B3.
The case demonstrates how eating disorders can lead to life-threatening nutritional deficiencies. The woman’s anorexia nervosa caused her to consume so little food that her body couldn’t maintain basic functions. Without adequate protein intake, her body couldn’t maintain tryptophan levels, and without sufficient niacin intake, she developed pellagra. The combination of these deficiencies, along with severe malnutrition, proved fatal.
Doctors also found Russell’s sign, which is a callus or scar on the knuckles that develops in people with bulimia (another eating disorder involving purging). This suggested the woman may have engaged in self-induced vomiting in addition to restricting food intake. The severe emaciation (extreme thinness) documented at autopsy showed how advanced the malnutrition had become. These additional findings paint a picture of someone with a severe, long-standing eating disorder that had progressed to life-threatening stages.
Pellagra was common in the early 1900s, particularly among poor populations with limited access to diverse foods. It became rare after food fortification (adding vitamins to processed foods) became standard practice in developed countries. However, research shows that pellagra still occurs in specific at-risk groups: people with severe eating disorders, those with chronic alcoholism, and individuals with certain medical conditions affecting nutrient absorption. This case aligns with existing medical knowledge that eating disorders remain a significant risk factor for pellagra, even in modern times.
This is a single case report, so we cannot draw broad conclusions about how common pellagra is in people with eating disorders or predict outcomes for other patients. The case was identified through autopsy, meaning the diagnosis came too late to help this patient. We don’t know how many other people with eating disorders might develop pellagra without being diagnosed. Additionally, case reports cannot establish cause-and-effect relationships or compare different treatments. However, the detailed documentation provides valuable information for healthcare providers to recognize similar cases earlier.
The Bottom Line
Healthcare providers should screen people with eating disorders for signs of pellagra, including distinctive rashes on sun-exposed areas, particularly the neck and chest. Patients with eating disorders should work with medical teams to restore adequate nutrition, including sufficient protein and B vitamins. Anyone struggling with an eating disorder should seek professional help immediately, as these conditions can cause serious, life-threatening complications. Nutritional rehabilitation is a critical part of eating disorder treatment. (Confidence level: High - based on medical evidence and this documented case)
This case is most relevant to healthcare providers treating eating disorders, mental health professionals, forensic pathologists, and people with eating disorders or their families. Anyone with anorexia nervosa, bulimia, or other restrictive eating patterns should be aware that severe malnutrition can cause rare but serious diseases. People with chronic alcoholism should also be aware of pellagra risk. This case is less directly relevant to people without eating disorders or substance abuse issues, as pellagra is extremely rare in the general population with adequate nutrition.
Pellagra develops gradually as nutritional deficiency worsens over time. Early signs (like skin rashes) might appear within weeks to months of severe malnutrition. However, the progression to fatal complications can take months to years depending on the severity of the eating disorder and overall health. This case emphasizes that seeking treatment early is critical—waiting until symptoms become severe greatly increases the risk of irreversible damage or death.
Frequently Asked Questions
Can you get pellagra from an eating disorder?
Yes. A 2026 case report documented a fatal pellagra case in a woman with anorexia nervosa. Severe food restriction prevents adequate intake of niacin (vitamin B3) and tryptophan, an amino acid the body needs to produce B3. People with eating disorders remain at serious risk for this rare but life-threatening nutritional deficiency.
What is Casal’s necklace and why does it matter?
Casal’s necklace is a distinctive rash pattern that appears on the neck and upper chest in pellagra cases. It’s a key diagnostic sign doctors look for. The 2026 case report emphasizes that recognizing this rash pattern could help identify pellagra earlier, potentially saving lives in at-risk populations like those with eating disorders.
How common is pellagra today?
Pellagra is rare in developed countries due to food fortification (adding vitamins to processed foods). However, it still occurs in specific at-risk groups: people with severe eating disorders, those with chronic alcoholism, and individuals with certain medical conditions. The 2026 case demonstrates pellagra remains a serious concern in eating disorder populations.
What should I do if I have an eating disorder?
Seek professional help immediately. Eating disorders can cause serious, life-threatening complications including rare nutritional deficiencies like pellagra. Work with a medical team including doctors and registered dietitians to restore adequate nutrition. Early treatment is critical—the 2026 case shows how severe malnutrition can become fatal.
Can pellagra be treated?
Yes, pellagra is preventable and treatable when caught early through adequate niacin and protein intake. However, the 2026 case was diagnosed only at autopsy, too late to help. Early recognition of symptoms and nutritional rehabilitation are essential. Anyone with eating disorders should receive medical screening for nutritional deficiencies.
Want to Apply This Research?
- Users managing eating disorder recovery could track daily protein intake (grams), B-vitamin consumption (especially niacin/B3), and visible skin health changes. Set a daily protein goal of 50-60 grams and monitor for any unusual rashes or skin changes, reporting these to healthcare providers immediately.
- Users could use the app to log meals and receive alerts when daily niacin and tryptophan intake falls below recommended levels. Set reminders to include protein-rich foods (chicken, fish, eggs, legumes, nuts) at each meal. Connect with a registered dietitian through the app for personalized meal planning that ensures adequate B-vitamin intake.
- Track weekly weight trends, energy levels, and skin condition photos. Set monthly check-in reminders to review nutritional adequacy with a healthcare provider. Create alerts for any new skin changes or symptoms that might indicate nutritional deficiency, prompting immediate medical consultation.
This case report documents a single fatal case of pellagra and is not medical advice. If you or someone you know is struggling with an eating disorder, please seek professional help immediately from a healthcare provider, mental health professional, or eating disorder specialist. Pellagra is a serious medical condition requiring professional diagnosis and treatment. Do not attempt self-diagnosis based on this information. If you experience symptoms like unusual rashes, skin changes, or signs of malnutrition, contact a healthcare provider right away. This article is for educational purposes only and should not replace professional medical consultation.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.