Does a reasonable daily dose of lactose cause symptoms in patients with self-reported lactose intolerance?
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Individuals who report lactose intolerance are usually able to ingest a daily lactose dose equivalent to at least 1 cup of milk (12 g lactose) without significant symptoms. (SOR: B, based on a meta-analysis and a systematic review with heterogeneity.) Daily doses of lactose equivalent to about 1.8 cups of milk (22 g lactose) can be tolerated if ingested with nutrients other than milk. (SOR: B, based on small RCTs with heterogeneity.)
Evidence-based practice 14, no. 06 (2011): 10