As has been pointed out many times, there are two levels of lead poisoning.
1) acute levels where you are exposed to high levels and you become ill quickly. Breathing in lead dust, or ingesting paint.
An example reported last year
The UK Health Security Agency says it is checking a recent change to ventilation at the building.
www.bbc.co.uk
2) chronic exposure where low level environmental exposure builds up in body tissues. Environmental exposure is from breathing in or ingesting lead and lead compounds. Stomach acids are about the same acid levels as battery acids so any lead ingested will be exposed to acid and will be partially dissolved and adsorbed. Smaller particles the quicker this will happen. Meat is also acidic, so lead shot in meat will also dissolve.
And lead builds up in body tissues. World Health Organisation is very clear about the dangers of lead to health.
Exposure to lead in children can bring about all sorts of deliquency. In adults problems with fertility and as we get older cognitive capacity.
There are also studies showing high correlation between elavated levels of lead in your bones and blood and the bodies ability to control disease, in particular cancers.
There are therapies being developed for cancer treatments that involve removal of lead from the body. And we are not talking about high levels, we are talking micro or indeed nano grams per litre of blood.
These have all been covered multiple times on this forum. The big challenge with lead poisoning is that other than putting it through you at high velocity, the effects of lead exposure are long term and cumulative so somewhat difficult to say that eating that lead shot duck in 1980 or cleaning off that lead paint in 2000 has brought about the leukaemia you are now dying from.