Sulphites
Summary
What it is
Common uses
Public Perception
Anxiety level
Cultural claims
Source sentiment
History
Timeline
Origin
Science
Key findings
Studies
Safety status
Nuance
Alternatives
Swaps
Avoidance tips
References

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Sulphites

ingredientPreservatives

Total Sources: 44

Verified Claims: 39

Scientific Sources: 20

Also known as: Sulfites, Sulphur Dioxide

Summary

Sulfites are preservatives used in food and pharmaceutical industries to prevent spoilage and discoloration [2], [8]. They can occur naturally or be added to products [7], [18].

What it is

Sulfites are a group of sulfur-containing compounds, including sulfur dioxide and various sulfite salts, used as preservatives, antioxidants, or bleaching agents [7], [8], [22]. Common additives are sulfur dioxide (E 220), sodium sulfite (E 221), sodium bisulfite (E 222), sodium metabisulfite (E 223), potassium metabisulfite (E 224), calcium sulfite (E 226), calcium bisulfite (E 227) and potassium bisulfite (E 228) [1], [3], [18].

Common uses

  • Prevent browning and discoloration [2], [8]

  • Inhibit microbial growth [2], [18]

  • Extend shelf life [2], [18]

  • Bleaching agent [22]

Public Perception

Anxiety level

Moderate. Concerns exist regarding potential allergic reactions and general unease about chemical additives in food [8], [20], [22].

Cultural claims

  • Some consumers express fear regarding 'chemicals' in food, while simultaneously embracing ingredients perceived as natural, such as electrolytes [39].

  • There is a perception that 'chemicals' are harmful and unnatural, while 'vitamins' and 'electrolytes' are beneficial and life-giving [39].

Source sentiment

Sulfites have a mixed reputation; while recognized as effective preservatives, they are also associated with potential adverse reactions in sensitive individuals [8], [20].

History

Timeline

1600

Frenchman Olivier de Serres noted that Germans used sulfur to 'parfumer les tonneaux' (very large wooden wine barrels) [27].

1635

The 'mesche de soufre' was listed in a French-Latin dictionary [27].

1800

Winemakers have been adding sulfur dioxide to wine since the 1800s [23].

1876

Bacon curing was described by Edward Smith as the process whereby pork is 'preserved by salt and saltpeter' [28].

1970

The use of sulfur dioxide for food preservation became commonplace [26].

1986

The FDA banned the use of sulfites on fresh fruits and vegetables intended to be eaten raw in restaurants [23], [26].

Origin

Sulfur dioxide has been used since ancient times as a purifier and disinfectant [8].

Science

Key findings

  • Sulfites can induce adverse clinical effects in sensitive individuals, including dermatitis, urticaria, flushing, hypotension, abdominal pain, diarrhea, and life-threatening anaphylactic and asthmatic reactions [8].

  • Short-term exposure to sulfur dioxide is linked to chronic obstructive pulmonary disease [6].

  • Studies suggest that sodium acetate and sodium sulfite may have cytotoxic and genotoxic effects on human lymphocytes, especially at high concentrations [2].

Studies

Update of the dietary exposure to sulfur dioxide (E 220), sodium sulfite (E 221), sodium bisulfite (E 222), sodium metabisulfite (E 223), potassium metabisulfite (E 224), calcium sulfite (E 226), calcium bisulfite (E 227) and potassium bisulfite (E 228)…

Dietary exposures estimated using maximum permitted levels would result in MOEs below 80 in all population groups at the maximum of the ranges of the mean, and for most of the population groups at both minimum and maximum of the ranges at the 95th percentile, raising a safety concern [1].

Analysis of genotoxic effects of food preservatives sodium ...

Sodium acetate (SA) and sodium sulfite (SS) significantly induced CAs and MN frequencies and caused a decrease in MI especially at higher concentrations, suggesting cytotoxic and genotoxic effects on human lymphocytes [2].

Follow‐up of the re‐evaluation of sulfur dioxide (E 220), sodium sulfite (E 221), sodium bisulfite (E 222), sodium metabisulfite (E 223), potassium metabisulfite (E 224), calcium sulfite (E 226), calcium bisulfite (E 227) and potassium bisulfite (E 228)

The Panel concluded that this raises a safety concern for both dietary exposure scenarios. The Panel also performed a risk assessment for toxic elements present in sulfur dioxide–sulfites (E 220–228), based on data submitted by IBOs, and concluded that the maximum limits in the EU specifications for arsenic, lead and mercury should be lowered and a maximum limit for cadmium should be introduced [3].

Short-term exposure to sulfur dioxide and the occurrence of chronic obstructive pulmonary disease: An updated systematic review and meta-analysis based on risk of bias and certainty of evidence

Several studies have documented a relationship between short-term exposure to atmospheric sulfur dioxide (SO2) and chronic obstructive pulmonary disease (COPD) [6].

Exposure assessment of food preservatives (sulphites ...

In the high-intake scenario assuming that consumers always consume food products that contain additives and considering a kind of brand loyalty of consumers, the ADI is exceeded for sulphites among adults (119 and 124%, respectively) [11].

Safety status

Generally recognized as safe (GRAS) by the FDA for specific uses, but can cause adverse reactions in sensitive individuals [15], [17], [22].

Nuance

While sulfites are essential for preserving certain foods and preventing spoilage, their potential to cause adverse reactions necessitates careful labeling and awareness, especially for sensitive individuals [7], [8], [22].

Alternatives

Sulfite-free wines

To avoid sulfite-related reactions for sensitive individuals [34].

Fresh produce

To avoid sulfites used in processed or preserved fruits and vegetables [20].

Organic dried fruits

Often free of sulfur dioxide preservatives [26].

Avoidance tips

  • Carefully read food labels to identify products containing sulfites [22], [24].

  • Inquire about food preparation methods at restaurants to avoid hidden sources of sulfites [40].

  • Choose fresh, unprocessed foods whenever possible [20].

  • Be cautious of foods that commonly contain sulfites, such as wine, dried fruits, and pickled items [25].

References

1.

https://www.efsa.europa.eu/en/supporting/pub/en-9754