**3.1 Effects of lead on intelligence quotient**

Lead in the brain affects intelligence quotient (IQ) of school age child. IQ measured at 3.8 years is affected by 5 μg/dl of lead concentration in the brain [44]. The established Benchmark limit doses of 1% extra risk are for intelligence quotient (IQ- BMDL01) (12 μg/dl), systolic blood pressure, SBP-BMDL01 (36 μg/dl) and chronic kidney disease, CKD- BMDL01 (15 μg/dl) respectively. Increased blood lead of 1–6.7 μg/dl is associated with mortality from ischaemic heart disease and cardiovascular disease [45] This may likely affect 600,000–900,000 population of Sweden that consume game meat [46].
