Flexibility is the ability of the human body to move in a balanced manner. Normally thin, stretching people are more flexible. Muscles have a greater problem of flexibility, because the excess of muscle hinders some movements. This is common in people who practice hypertrophy, the practice of building muscle through exercise at the gym.
Aspartame contains Phenylalanine. PKU is a genetic defect that causes Phenylalanine to build up in their system. people with pku need to be on a low protein diet with no aspartame because it'll cause build up in their bodies and can cause intellectual disabilities