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The A2 milk case: a critical review.

A S Truswell¹

¹Human Nutrition Unit, University of Sydney, Australia. s.truswell@mmb.usyd.edu.au

European Journal of Clinical Nutrition

|May 4, 2005

Summary

The A1 beta-casein in cow milk is hypothesized to link to type I diabetes and heart disease. However, scientific evidence does not support this A1/A2 milk hypothesis for adverse human health effects.

Area of Science:

Nutrition Science
Immunology
Cardiovascular Health

Background:

A hypothesis suggested A1 beta-casein in cow's milk may trigger type I diabetes (DM-I) and coronary heart disease (CHD).
This led to the development of A2 milk, containing only the A2 beta-casein variant, marketed as a healthier alternative.
The A1/A2 milk hypothesis proposed potential adverse health impacts of A1 beta-casein.

Purpose of the Study:

To critically review the scientific evidence supporting the A1/A2 milk hypothesis regarding type I diabetes and coronary heart disease.
To evaluate the reliability of studies linking A1 beta-casein consumption to these chronic diseases.
To assess the overall validity of the A1/A2 milk hypothesis in human health.

Main Methods:

Review of existing scientific literature and data.

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Critique of correlation studies between national A1 beta-casein consumption and disease rates.

Analysis of findings from animal experiments and prospective human studies.

Consideration of reports from food safety authorities.

Main Results:

Between-country correlation studies for DM-I and CHD were found to be unreliable and were negated by broader analyses and prospective studies.
Animal experiments supporting the diabetes link were not confirmed in larger, standardized multicenter trials.
The single animal study on A1 beta-casein and CHD had significant design flaws and limitations.
No convincing evidence emerged to support a link between A1 beta-casein and adverse health outcomes in humans.

Conclusions:

The A1/A2 milk hypothesis lacks convincing or probable scientific evidence for adverse effects of A1 beta-casein on human health.
Existing epidemiological and experimental data do not substantiate the proposed links to type I diabetes or coronary heart disease.
Regulatory bodies in Australia and New Zealand have also found no established relationship between A1/A2 milk and these diseases.