When it comes in contact with single-celled pathogens, such as viruses or parasites or bacteria, it disables the pathogens' metabolic enzymes, causing the pathogen to suffocate and die.

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In extreme cases, pediatricians have reported toddlers with hip displacement problems from carrying too much weight and metabolic abnormalities in their insulin, liver enzymes and cholesterol -- usually problems detected in older adults.

CNN: Obese children outgrowing kids' clothing and furniture