Experts agree that those who suffer from this uncommon genetic disorder need to limit their intake of aspartame. This congenital disability prevents the body breaking down the phenylalanine amino acid. Consequently, the phenylalanine could build upon their bloodstream to damage a child's brain development, or adversely affect the fetus in the mother's womb. A large number of foods contain phenylalanine, and it is a component of aspartame. This is why PKU sufferers must check food and drink contents for aspartame. They may have these products in limited amounts providing they are careful not to exceed their limits.
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