"I like sugar."
Translation:Mi piace lo zucchero.
From what I can see, "a me" is a more emphatic way of saying "mi" - it's the difference between a stressed pronoun and a clitic. This page may help to clear up some confusion: http://tutorino.ca/grammatica/italian-disjunctive-or-stressed-pronouns-i-pronomi-tonici.html
Can anyone explain why the lui/lei form piace is used here, rather than the io form piaccio?