Targeting women over 50 can be a great opportunity for some better4you brands since  many in that group practice unhealthy eating behaviors, a new study indicates.  The researchers found that almost 4 percent report binge eating, nearly 8 percent report purging, more than 70 percent diet to lose weight and 62 percent say their weight or shape adversely impacts their lives, according to the report published June 21 in the International Journal of Eating Disorders.  “Our ‘70 is the new 50′ society may be placing additional appearance pressures on women that perpetuate disordered eating practices well into older adulthood,” said lead researcher Cynthia Bulik, director of the University of North Carolina Eating Disorders Program.