Kids in nearly every part of the world are drinking more soda and other sugary drinks than ever, and child obesity rates are climbing to match, according to a new study that spans three decades and 185 countries. In 2018, children were having an average of 3.6 servings of sugary drinks per week, a 22.9 per cent increase from 1990 and a much sharper uptick than among adults, according to the study, which was published in The BMJ and led by researchers in the US, Greece, Canada, and Mexico. Child obesity rose in tandem during that time period, and now affects about 160 million kids and teens aro…