The increasing consumer shift toward plant-based beverages, driven by lactose intolerance and environmental consciousness, faces new scrutiny following a comprehensive review of packaged plant milk products in Hong Kong. The Consumer Council (CC) tested 39 samples, revealing significant discrepancies in nutritional labeling—including unverified vitamin content—and the presence of metal contaminants and pesticides in several products, prompting consumers to reconsider the nutritional parity of these alternatives to traditional dairy.
Published in the latest issue of CC’s monthly magazine, Choice (Issue 564), the investigation assessed 39 pre-packaged plant milk varieties—specifically, seven almond, five coconut, five rice, ten oat, and twelve soy milks—sourced from local retailers. While prices varied substantially, from $6 to $62.9 per package, the testing focused on crucial metrics like nutrient levels, mycotoxins, heavy metals, and the presence of the herbicide glyphosate. The key findings highlight a pervasive issue with labeling accuracy and potential public health risks associated with contaminants.
Nutritional Claims Under Scrutiny
A primary concern raised by the report centers on misrepresentation of added vitamins. Two oat milk samples, specifically listed as fortified with Vitamin D, showed no detectable traces of the vitamin upon testing. This inaccuracy directly impacts consumers relying on these products to supplement their Vitamin D intake. Overall, over 60% (26 out of 39) of the total samples exhibited discrepancies between their declared nutrient values on the packaging and the CC’s laboratory results, failing to meet the requirements of established technical guidelines. The CC noted that potential separation or sedimentation within the tetra pack might contribute to variability, suggesting consumers may ingest less nutrition than indicated unless the product is thoroughly mixed.
The report also compared the nutritional profile of plant milks against low-fat dairy. While six soy milk varieties demonstrated protein levels comparable to or higher than low-fat milk (ranging from 3.40g to 4.92g per 100ml)—including popular brands like Kikkoman, Vitasoy, and Maeil—calcium content varied drastically. Sixteen samples were classified as “high-calcium” per 100 kilocalories, yet when measured per 100 milliliters, four samples contained less than half the calcium found in low-fat milk. To consume an equivalent amount of calcium found in one cup (240ml) of low-fat milk, consumers would need to drink approximately 3.6 cups of the lower-performing high-calcium plant milk alternatives.
Contaminants Detected in Soy Milks
The investigation also identified the presence of unwanted substances across multiple categories of products. More than 60% of the soy milk samples tested, along with two oat milk brands, were found to contain nickel, a heavy metal contaminant. Concentrations ranged from 0.23 to 1.08mg per kilogram. For an average 60kg adult, consuming just three cups (720g) of the soy milk sample with the highest nickel content (Vitasoy) would result in an intake equivalent to the daily tolerable intake limit of 0.78mg set by regulatory bodies.
Furthermore, one specific soy milk sample (Kikkoman) tested positive for trace amounts of glyphosate, a common pesticide. Although the detected level (0.025 mg/kg) was far below the regulatory limit for dried soybeans and is not expected to pose an immediate health risk under typical consumption patterns, its presence adds to the overall safety concerns.
Consumer Takeaways and Market Implications
Despite these issues, the test identified 19 samples that achieved an overall rating of 4 points or higher (on a 5-point scale), demonstrating that high quality is not strictly tied to high price. Six products achieved a 4.5-star overall rating, including specific almond, soy, and oat milk variants from brands like Woolworths, Califia Farms, and Havredals.
The findings underscore the need for consumers, particularly those relying on plant milks for specific nutritional goals (such as high protein or calcium for bone health), to look beyond marketing claims and scrutinize specific nutrient content. The CC strongly urges manufacturers to adhere strictly to nutritional labeling regulations to ensure transparency and prevent misleading consumers. Hong Kong shoppers are advised to carefully examine the nutrient breakdown on packaging, especially for fortified products, and to consider choosing brands that performed well in the CC’s quality assessment.