Most of the metals found in baby foods are absorbed by the plants they are made from as they grow.

Think of it like this: Processes like mining and manufacturing release tiny particles of metal into the air. Those particles eventually fall to the ground, get in the groundwater and end up being absorbed by crops like rice and carrots as they grow.

When those crops are picked they already contain most if not all of the heavy metals the final, manufactured baby foods will contain. That's why Health Babies Bright Futures just released a report on managing the foods in even homemade baby foods.

Two things happen during the food manufacturing process that can increase that content. First, simply concentrating the vegetables or grains also can concentrate the levels of metals. That jar of baby food doesn't contain one carrot, it's a lot of carrots. The second is that vitamins and minerals added to baby foods can also contain small amounts of heavy metals. - Gary