食べ過ぎると太りますよ。

to eat; to live on (e.g. a salary); to live off; to subsist on

if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)

to grow fat (stout, plump); to become fat; to gain weight

indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!