By Sharon Natoli, Accredited Practising Dietitian and Director of Food & Nutrition Australia.
It can sometimes be easy for people to mistake a sensitivity to lactose for an allergy to cow’s milk. Although these terms are both related to certain reactions arising from drinking milk, they are actually medically quite different. As cow’s milk allergy and lactose sensitivity can often be confused, this blog helps to highlight the main differences between the two.
1. Occurrence
Cow’s milk allergy tends to occur mainly in infants with 1 in 50 infants in Australia and New Zealand affected1. Most children outgrow cow’s milk allergy by the age of four years so it is quite rare in adults1. In contrast, it is rare for babies to be born with a lactose sensitivity as breast milk contains around 7 per cent lactose2. Levels of the enzyme lactase, responsible for digesting lactose, can decrease with age meaning lactose sensitivity can develop as a person gets older2.
2. Causes
Cow’s milk allergy occurs when there is an overreaction by the body’s immune system to a specific protein found in cow’s milk3. The body reacts as if the protein is a foreign substance. In contrast, if you have a sensitivity to lactose, it’s generally due to not having enough of the enzyme lactase available to digest lactose or ‘milk sugar’4.
3. Management
To manage cow’s milk allergy all products made with cow’s milk must be avoided1. However people with a sensitivity to lactose don’t need to avoid milk completely. They can often tolerate small amounts of lactose in their diet, however need to avoid larger intakes5. For example a person with a lactose sensitivity may be able to include a small tub of yoghurt daily, as well as benefiting from the inclusion of lactose free foods, such as Pauls Zymil.
Note: if you suspect you may be allergic or intolerant to certain foods, it is important to confirm this with a health professional to ensure you’re not removing foods unnecessarily from your diet and to rule out any other medical issues that could be causing your symptoms.
For more information visit:
http://www.allergy.org.au
www.daa.asn.au
References:
1. ASCIA. Cow’s milk (dairy) allergy. 2010; Available from: http://www.allergy.org.au/content/view/143/138/.
2. Duggan, C., J.B. Watkins, and A.W. Walker, Nutrition in pediatrics: basic science, clinical applications – 4th ed. 2008, Hamilton, Ontario: BC Decker.
3. Hodge, L., A. Swain, and K. Faulkner-Hogg, Food allergy and intolerance. Australian Family Physician, 2009. 38(9): p. 705-707.
4. Hark, L. and D. Deen, Nutrition: the definitive australian guide to eating for good health. 2005, Camberwell: Dorling Kindersley.
5. Suarez, F.L., et al., Lactose maldigestion is not an impediment to the intake of 1500 mg calcium daily as dairy products. Am J Clin Nutr, 1998. 68(5): p. 1118-22.
Tips for Lactose Intolerance