The European Food Safety Authority (EPSA) has once again stated that 400 g of shellfish should be considered a big portion. It considers that above this weight there is a potential for marine biotoxins are a health risk.

Symptoms from marine biotoxins include nausea, and cramps, as well as being considered carcinogenic if consumed over a long time.

The EFSA was first asked to provide an opinion on the issue in 2006 , but there was insufficient data available at the time to determine the maximum weight.

Since then several countries in the EU have supplied data that has now been used to determine the 400g maximum portion size. It has been confirmed when further data became available form some other member countries.