Section 72
Chapter 71,089

Milk Containing A2 β-Casein ONLY, as a Single Meal, Causes Fewer Symptoms of Lactose Intolerance than Milk Containing A1 and A2 β-Caseins in Subjects with Lactose Maldigestion and Intolerance: A Randomized, Double-Blind, Crossover Trial

Ramakrishnan, M.; Eaton, T.K.; Sermet, O.M.; Savaiano, D.A.

Nutrients 12(12)


ISSN/ISBN: 2072-6643
PMID: 33348621
DOI: 10.3390/nu12123855
Accession: 071088266

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Acute-feeding and multiple-day studies have demonstrated that milk containing A2 beta-casein only causes fewer symptoms of lactose intolerance (LI) than milk containing both A1 and A2 beta-caseins. We conducted a single-meal study to evaluate the gastrointestinal (GI) tolerance of milk containing different concentrations of A1 and A2 beta-casein proteins. This was a randomized, double-blind, crossover trial in 25 LI subjects with maldigestion and an additional eight lactose maldigesters who did not meet the QLCSS criteria. Subjects received each of four types of milk (milk containing A2 beta-casein protein only, Jersey milk, conventional milk, and lactose-free milk) after overnight fasting. Symptoms of GI intolerance and breath hydrogen concentrations were analyzed for 6 h after ingestion of each type of milk. In an analysis of the 25 LI subjects, total symptom score for abdominal pain was lower following consumption of milk containing A2 beta-casein only, compared with conventional milk (p = 0.004). Post hoc analysis with lactose maldigesters revealed statistically significantly improved symptom scores (p = 0.04) and lower hydrogen production (p = 0.04) following consumption of milk containing A2 beta-casein only compared with conventional milk. Consumption of milk containing A2 beta-casein only is associated with fewer GI symptoms than consumption of conventional milk in lactose maldigesters.

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