Some ceramic dishes contain lead. Such dishes should not be used to cook or store food, since the acids can leach large amounts of lead from dishes into de food. Occasionally lead may contaminate food. Soil lead is taken up by root vegetable and atmospheric lead may fall onto leafy vegetables. Cans with soldered seams can also add lead to foods.
Hygiene measures are key.
Cockroaches are found where there is water and food. Eating should be discouraged in areas other than in the kitchen. All foodstuffs should be stored in closed containers. Water sources should be eliminated by caulking cracks around faucets and pipe fittings. Pediatric Environmental Health , AAP,1999.