What sandwich fillers can I have?
Fish is a good source of many vitamins and minerals. However, you should limit how much tuna you eat, because it has more mercury in it than other fish. If you eat too much mercury, it can be harmful to your unborn baby. You should eat no more than 2 tuna steaks (about 140g cooked or 170g raw) or 4 medium-size cans of tuna (about 140g when drained) per week.
Ham and cured meats
It is safe to eat cold, pre-packed meats such as ham and corned beef. Although the risk is low, you may also prefer to avoid raw cured meat, such as parma ham, chorizo, pepperoni and salami. Cured meats are not cooked, so they may parasites in them that cause toxoplasmosis.
Hard cheeses like cheddar are safe to eat during pregnancy. Find out more about cheeses that are best to avoid.
It is safe to eat shop-bought mayonnaise during pregnancy. If the mayonnaise has been freshly made, check that it has been made using Red lion eggs, otherwise it is best to avoid.