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Consumer Reports has conducted tests on 12 lunch and snack kits, finding concerning levels of lead, cadmium, or both in all of them.
The heavy metals can lead to developmental problems in children, according to Kevin Loria.
Smithfield Foods, the company behind Armour LunchMakers, claims their products meet safety standards and that lead and cadmium occur naturally.
The tests also revealed high sodium levels in the kits, which can increase the risk of hypertension in children.
Consumer Reports advises parents to opt for healthier school lunch options and encourage their kids to drink water or plain milk instead of sugary beverages.
