To paint over old wall paint with wall paint free of lead can help to reduce the danger for lead contamination but contact experts in order to know the best choice and procedure . Remember to wash sponges and mops thoroughly after they're used on the lead-based paint. Organic Lead from plants is not poisonous. Planting herbs, sunflowers etc. However most damage is hard to detect.
Different persons react differently.
It can take many years if the person does not do anything about it, but even extremely small amounts are dangerous for children especially. It is often difficult to pinpoint exact reasons for symptoms whenever they occur. But a simple blood test of lead levels can be a good indication. Our goal must be to minimize all kinds of poisons since it can be too difficult to eliminate poisons totally. The PetFood Industry sometimes supplies food contaminated with lead to Poultry etc.