Lactose intolerance and gastrointestinal cow's milk allergy in infants and children - common misconceptions revisited
Affiliations
Affiliations
- Murdoch Childrens Research Institute, Melbourne, Australia.
- Al Adan Hospital, Ministry of Health, Kuwait City, Kuwait.
- Rainbow Children's Hospital, Banjara Hills, Hyderabad, India.
- Philippine Society of Allergy, Asthma & Immunology, Philippine Medical Association, Quezon City, Philippines.
- Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China.
- Universidad National Autonoma de México, Hospital Infantil Privado Star Médica, Polanco, Mexico City, Mexico.
- Chualalongkorn University, Bangkok, Thailand.
- KK Women's and Children's Hospital and Yong Loo Lin School of Medicine and Duke-NUS Medical School, Singapore, Singapore.
- University of the Philippines, Philippine General Hospital, Manila, Philippines.
Abstract
Lactose is the main carbohydrate in human and mammalian milk. Lactose requires enzymatic hydrolysis by lactase into D-glucose and D-galactose before it can be absorbed. Term infants express sufficient lactase to digest about one liter of breast milk daily. Physiological lactose malabsorption in infancy confers beneficial prebiotic effects, including the establishment of Bifidobacterium-rich fecal microbiota. In many populations, lactase levels decline after weaning (lactase non-persistence; LNP). LNP affects about 70% of the world's population and is the physiological basis for primary lactose intolerance (LI). Persistence of lactase beyond infancy is linked to several single nucleotide polymorphisms in the lactase gene promoter region on chromosome 2. Primary LI generally does not manifest clinically before 5 years of age. LI in young children is typically caused by underlying gut conditions, such as viral gastroenteritis, giardiasis, cow's milk enteropathy, celiac disease or Crohn's disease. Therefore, LI in childhood is mostly transient and improves with resolution of the underlying pathology. There is ongoing confusion between LI and cow's milk allergy (CMA) which still leads to misdiagnosis and inappropriate dietary management. In addition, perceived LI may cause unnecessary milk restriction and adverse nutritional outcomes. The treatment of LI involves the reduction, but not complete elimination, of lactose-containing foods. By contrast, breastfed infants with suspected CMA should undergo a trial of a strict cow's milk protein-free maternal elimination diet. If the infant is not breastfed, an extensively hydrolyzed or amino acid-based formula and strict cow's milk avoidance are the standard treatment for CMA. The majority of infants with CMA can tolerate lactose, except when an enteropathy with secondary lactase deficiency is present.
Keywords: Carbohydrate; Celiac disease; Cow’s milk allergy; Enteropathy; Gastroenteritis; Malabsorption.
Conflict of interest statement
Not required.All authors have reviewed the manuscript and have provided their consent for publication.Dr. Ralf Heine has been a member of the scientific advisory boards of Nestlé Health Science / Nestlé Nutrition Institute, Australia/Oceania and Nutricia Australia. He has received honoraria from industry for educational activities. All authors have received reimbursement for travel expenses for this project from Nestlé Health Science, Switzerland. The authors otherwise declare that they have no competing interests.Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
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