The Hong Kong Consumer Council (COC) has published concerning findings following a comprehensive analysis of 28 pre-packaged butter, margarine, and spread products readily available on the market. Released in Issue 551 of its monthly magazine, Choice, the investigation revealed widespread presence of contaminants, including a carcinogen in one sample exceeding anticipated EU limits and high levels of glycidyl esters (GE) in nearly all vegetable-oil based products. The study also highlighted significant variability in fatty acid profiles and sodium content across the diverse range of samples, offering consumers crucial data for making informed health decisions.
Toxic Compounds and Regulatory Concerns Revealed
The key concern centered on carcinogenic compounds. One sample was found to contain Epoxypropanol (GE) at levels above the European Union standard of 1,000 micrograms per kilogram (μg/kg). This substance, an intermediate formed during the high-temperature industrial processing of vegetable oils, is classified as a genotoxic carcinogen. Alarmingly, 15 out of 16 tested products containing vegetable oils showed detectable levels of this contaminant, ranging from 60 μg/kg to 1,500 μg/kg, with the Earth Balance Original Buttery Spread registering the highest amount.
Furthermore, the COC detected Benzo[a]pyrene—a WHO-classified “carcinogen to humans”—in one sample, Snow Brand Premium Vegetable Margarine, at 0.8 μg/kg. While this level falls below Hong Kong’s current safety limit for edible oils (10 μg/kg), the limit is set to tighten to 5 μg/kg in June 2023, and the EU already enforces a stricter ceiling of 2 μg/kg. Consumers are advised to minimize intake of such genotoxic substances where possible.
Widespread Presence of Phthalates Across Selections
The research also detected plasticizers, specifically phthalate esters, in over 60% of the tested samples. Phthalates can leach into food during manufacturing, storage, or packaging, and chronic exposure has been linked to potential endocrine and reproductive system disruption. However, the COC reassured consumers that the detected amounts in this study were generally within existing safety parameters, meaning normal consumption quantities are unlikely to pose immediate health risks.
When evaluating overall nutritional value, the study indicated clear differences between traditional butter and processed spreads:
- Butter Sample Average: Higher in total fat (82.1g/100g), saturated fat (46.0g/100g), and trans fats (3.5g/100g).
- Spreads/Margarine Samples: Generally lower across the board in total fat and saturated fat, though most contained GE/3-MCPD, substances absent in all pure butter samples.
Despite the contamination issues, two products, Flora Light Spread and Meadows Spread with Sunflower Oil, achieved the highest five-star rating from the Consumer Council for overall safety and nutritional profile. Notably, only one vegetable oil-based product, Daisy Butter Blend Spread (Salted), was free from GE.
Expert Advice for Safer Consumption
Given the findings, the Consumer Council strongly advised members of the public to exercise caution when selecting and consuming these products. They reiterated that all three categories—butter, margarine, and spreads—are high-fat foods and should be consumed sparingly as part of a balanced diet.
The COC provided the following essential safety tips for consumers:
- Prioritize Nutritional Labels: Carefully read product descriptions and nutritional labels, focusing on selections with lower saturated and trans fat content and higher levels of unsaturated fatty acids.
- Examine Contaminant Levels: When selecting vegetable-based spreads, refer to the COC report to choose brands with the lowest detected contaminant levels (GE/3-MCPD).
- Storage and Shelf Life: Always verify the product packaging integrity and expiry dates. Store unopened items as directed, and once opened, adhere strictly to the recommended refrigeration and consumption windows.
- Avoid High-Heat Cooking: Spreads, especially those derived from blends, should generally not be used for high-temperature cooking, as this can alter their chemical structure and potentially increase exposure to harmful compounds.
Readers seeking the complete product comparison chart and detailed findings are encouraged to consult the original investigation published in Choice Issue 551.