This is an irregular verb. It follows the conjugation pattern of the verb conduzir.
Present:
A Ana reduz o consumo de açúcar dela.
A Ana reduz o consumo de açúcar.
Ana reduces her sugar intake.
Preterite:
O Miguel reduziu os custos do projeto.
Miguel reduced the costs of the project.
Conditional:
A Clara reduziria o tempo gasto em reuniões.
Clara would reduce the time spent on meetings.