8.
Safe nutrition
The immune system is partially suppressed during pregnancy, increasing the risk for foodborne
infections. All hygiene requirements should thus be respected while cooking, with adequate
heat treatment of eggs, meat and fish. The protozoan Toxoplasma gondii is found in uncooked
products of animal origin, and vegetables and berries may also be infected with toxoplasma
cysts if they have been in contact with infected soil. Therefore, all vegetables and fruit that
might have been in contact with soil should be carefully washed, and consumption of meat that
has not been heat processed or has undergone only light heat treatment should be avoided
during pregnancy, as cysts persist in frozen and smoked meat. To avoid infection with T. gondii:
• hands should be washed with soap,
• meat should be cooked adequately, and
• all kitchen equipment and utensils should be carefully washed after use.
Listeriosis is caused by the bacterium Listeria monocytogenes found in food products that have
not been properly stored. Proliferation is very slow in a refrigerator. The bacteria may cross the
placental barrier and infect the fetus. To avoid infection, routine hygiene requirements should
be followed:
• raw, unpasteurized milk and its products should not be consumed;
• food with an inappropriate shelf-‐life date should not be consumed, and food should be
stored appropriately; and
• soft cheese (e.g. Brie, Camembert) produced from unpasteurized milk (usually indicated on
the package) should be avoided.
Uncooked products of animal origin also increase the risks for other infections, such as
salmonellosis.
General recommendations:
-‐ Uncooked products of animal origin should not be eaten. These include raw meat,
undercooked meat products such as sausages and hams, uncooked fish and seafood (e.g. in
sushi), smoked fish, unpasteurized milk and raw eggs.
-‐ Uncooked and sprouted seeds, grain and beans should be avoided.
-‐ Frozen meat should not be left to thaw or marinate at room temperature but in the
refrigerator.
-‐ Soft cheese such as Brie, feta and blue cheese should be avoided unless the label clearly
states that the product was prepared from pasteurized milk.
-‐ Uncooked vegetables, salad leaves and fruit should be carefully washed before use.
-‐ Products grown in the soil or close to the soil should be stored separately from other
products.
-‐ Food should be consumed immediately after cooking.
-‐ Hygiene requirements should be closely observed: hands should be washed, food should be
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adequately stored, and separate kitchen utensils should be used for cooked and uncooked
products.
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