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How much lactose is low lactose?

S R Hertzler¹, B C Huynh, D A Savaiano

¹Department of Food Science and Nutrition, University of Minnesota, St. Paul, USA.

Journal of the American Dietetic Association

|March 1, 1996

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Lactose maldigesters can tolerate up to 6g of lactose per serving without significant symptoms. Even small amounts of lactose, like 2g, do not increase breath hydrogen or cause intolerance.

Area of Science:

Gastroenterology
Human Nutrition
Metabolic Disorders

Background:

Lactose maldigestion is common, leading individuals to avoid dairy.
The threshold for lactose tolerance in maldigesters is not well-defined.

Purpose of the Study:

To determine the minimum lactose dose causing intolerance in maldigesters.
To test if complete lactose elimination is necessary for tolerance.

Main Methods:

Double-blind, randomized study with 13 lactose maldigesters.
Administered challenge doses of 0, 2, 6, 12, and 20g lactose.
Measured breath hydrogen production and symptom responses.

Main Results:

No significant increase in breath hydrogen or symptoms at 2g lactose.

Related Experiment Videos

Increased hydrogen production at 6g, but symptoms were minimal.

Abdominal pain increased at 12g, flatulence at 20g. Diarrhea showed no significant difference.

Conclusions:

Lactose maldigesters can tolerate up to 6g of lactose per serving.
Foods with 6g lactose or less, like hard cheeses or small milk servings, may be tolerated.
Complete lactose elimination may not be necessary for dietary management.