[1] Diego Port Univ, Sch Commun, Santiago 240, Chile
[2] Univ Chile, Inst Nutr & Food Technol, El Libano 5524, Chile
[3] Univ N Carolina, Gillings Sch Global Publ Hlth, Dept Nutr, Chapel Hill, NC 27599 USA
[4] Univ N Carolina, Carolina Populat Ctr, Chapel Hill, NC 27516 USA
[5] Univ N Carolina, Sch Media & Journalism, Chapel Hill, NC 27599 USA