In its re-evaluation of sulphur dioxide and sulphites (E220-228, including calcium sulfite E226 and calcium bisulfite E227), EFSA could not confirm the existing group ADI: it set the group ADI of 0.7 mg SO2 equivalents/kg bw per day as only temporary pending more data, and estimated dietary exposure at high consumption raised a safety concern for most population groups.
EFSA was unable to confirm that sulphites are safe at current intake levels. It made the acceptable daily intake only temporary while it waits for more data, and found that heavy consumers could be taking in more than the safe amount.