In Holiday in Death, Eve snagged an energy bar and a tube of Extra-Zing Coke from a vending machine.[1]

In Innocent in Death, Peabody stood in front of a vending machine and tried to decide whether to order an Energy Bar or a Goo-Goo bar.  "The Energy Bar is, of course, nutritionally balanced, but the Goo-Goo is delicious ..."  The Goo-Goo bar contains fake chocolate and sugar; they make people feel a little nauseated.[2]  Other mentions.[3]

  1. Holiday in Death (ISBN 0-425-16371-7), p. 82
  2. Innocent in Death (ISBN 978-0-399-15401-0), pp. 150, 151
  3. Kindred in Death (ISBN 978-0-399-15595-6), p. 178