It is possible that high aspartame intake could worsen asthma and other kinds of allergies. This theory is quite popular, but again it lacks support from the medical profession. Someone who suffers badly from allergies might want to put this idea to a personal test. They could do their best to cut out products containing aspartame from their diet for a certain period. They might even try to increase their intake for another length of time and then compare their allergic experiences for these two test periods.

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