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Malabsorption syndrome — Clinical Guidelines

Overview

Malabsorption syndrome encompasses a range of conditions characterized by impaired absorption of nutrients in the gastrointestinal tract, leading to deficiencies and malnutrition despite adequate intake. 1 14

Diagnosis

Clinical Presentation: Symptoms include weight loss, diarrhea, bloating, and nutrient deficiencies.

Laboratory Tests:

- Fecal fat tests to assess steatorrhea. - Serum levels of vitamins and minerals (e.g., vitamin D, B12, iron, folate). - Amino acid analysis in stool and blood.

Imaging and Endoscopy: To identify structural abnormalities or specific lesions.

Nutritional Assessment: Including anthropometric measurements and dietary intake evaluation. 1 14 15

Management

Dietary Modifications:

- High-protein, high-calorie diet with medium-chain triglycerides (MCTs) to reduce fat malabsorption. - Low-fat diet to minimize steatorrhea.

Supplementation:

- Micronutrient supplementation tailored to identified deficiencies (e.g., vitamins D, B12, folate, riboflavin). - Parenteral nutrition (enteral or parenteral) for severe cases.

Specific Therapies:

- Vitamin D supplementation via oral or alternative routes (e.g., buccal spray) for malabsorption issues. 2 4 7 11

Special Populations

Pediatrics: Home artificial nutrition (HEN/HPN) is crucial for managing complex nutritional needs in children with malabsorption syndromes. 1

Comorbidities: Patients with intestinal surgery or specific genetic conditions (e.g., riboflavin transporter deficiency) require tailored supplementation strategies. 6 15

Key Recommendations

Identify and Correct Underlying Pathology: Aggressive diagnostic workup to address the root cause of malabsorption and initiate specific treatments. (Evidence: Strong 1 14)

Tailored Nutritional Supplementation: Regular monitoring and supplementation of deficient micronutrients based on laboratory markers, especially vitamins D and B12, and minerals like iron and selenium. (Evidence: Moderate 2 11)

Consider Alternative Routes for Vitamin Supplementation: In cases of severe malabsorption, explore alternative routes such as buccal spray for vitamin D to enhance absorption. (Evidence: Weak 7)

Use of MCTs in Diet: Incorporate medium-chain triglycerides in the diet to improve fat absorption and reduce steatorrhea. (Evidence: Expert opinion)

References

1 Lezo A, Diamanti A, Cravero L, Capriati T, Lacitignola L, Gandullia P et al.. Italian SIGENP (Italian Society of gastroenterology, hepatology and pediatric nutrition) registry of pediatric home artificial nutrition: First report. Clinical nutrition ESPEN 2025. link 2 Gardner G. Micronutrient supplementation in patients with malabsorptive conditions. Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition 2024. link 3 . Intravenous vitamin injections: where is the evidence?. Drug and therapeutics bulletin 2023. link 4 Charoenngam N, Kalajian TA, Shirvani A, Yoon GH, Desai S, McCarthy A et al.. A pilot-randomized, double-blind crossover trial to evaluate the pharmacokinetics of orally administered 25-hydroxyvitamin D3 and vitamin D3 in healthy adults with differing BMI and in adults with intestinal malabsorption. The American journal of clinical nutrition 2021. link 5 Enko D, Kriegshäuser G, Stolba R, Mangge H, Brandstetter D, Mayr N et al.. Assessment of vitamin D status and serum CrossLaps levels in adults with primary lactose malabsorption. European journal of clinical nutrition 2016. link 6 Subramanian VS, Lambrecht N, Lytle C, Said HM. Conditional (intestinal-specific) knockout of the riboflavin transporter-3 (RFVT-3) impairs riboflavin absorption. American journal of physiology. Gastrointestinal and liver physiology 2016. link 7 Satia MC, Mukim AG, Tibrewala KD, Bhavsar MS. A randomized two way cross over study for comparison of absorption of vitamin D3 buccal spray and soft gelatin capsule formulation in healthy subjects and in patients with intestinal malabsorption. Nutrition journal 2015. link 8 Said HM. Intestinal absorption of water-soluble vitamins in health and disease. The Biochemical journal 2011. link 9 Lee WB, Schwab IR. Intestinal surgery a villain?. The British journal of ophthalmology 2006. link 10 Said HM, Mohammed ZM. Intestinal absorption of water-soluble vitamins: an update. Current opinion in gastroenterology 2006. link 11 Reimund J, Duclos B, Cuby C, Malzac D, Zimmermann F, Dietemann JL et al.. Home parenteral nutrition: clinical and laboratory analysis of initial experience (1994-1997). Implications for patient management. Annals of nutrition & metabolism 1999. link 12 Kasai S, Nakano H, Kinoshita T, Miyake Y, Maeda K, Matsui K. Intestinal absorption of riboflavin, studied by an in situ circulation system using radioactive analogues. Journal of nutritional science and vitaminology 1988. link 13 Hill DL, Grubbs CJ. Intestinal absorption of nutrients in animals dosed orally with retinoids: considerations for chemopreventive studies. Cancer investigation 1985. link 14 Cerda JJ, Artnak EJ. Nutritional aspects of malabsorption syndromes. Comprehensive therapy 1983. link 15 ten Hove W, Baker H. Micro-nutrient deficiency in a case of jejunoileal bypass. Journal of the American College of Nutrition 1982. link

Malabsorption syndrome