Which factor increases children's absorption of lead compared to adults?

Children exhibit greater absorption of lead compared to adults primarily due to their hand-to-mouth behavior. This natural tendency in young children, who are still developing their coordination and are often exploring their environment, leads them to put various objects, including contaminated items, in their mouths. The lead particles can easily be ingested this way, increasing their risk of exposure and absorption into the body.

In children, the absorption rate for lead is significantly higher than in adults. Their physiological differences, such as their developing gastrointestinal systems, also enhance lead absorption. This puts them at a greater risk for lead poisoning, which can adversely affect their cognitive and physical development.

While other factors, such as body weight and dietary habits, can influence lead absorption, hand-to-mouth behavior is the critical factor that directly relates to the increased risk in children.