Robson E, Norris T, Costa S, et al. - This study was undertaken to investigate the relationship of 20-year body mass index (BMI) and waist circumference (WC) histories with risk of being metabolically unhealthy overweight/obese vs metabolically healthy overweight/obese and 2) metabolically unhealthy normal weight vs metabolically healthy normal weight (MHNW). Researchers enrolled 3,018 adults (2,280 males; 738 females) with BMI and WC measured, every ~5 years, in 1991-1994, 1997-1999, 2002-2004, 2007-2009, and 2012-2013. The outcomes demonstrate the importance of maintaining optimum and stable BMI and WC, both in adults who become and do not become overweight/obese.