Sugar content of most supermarket yogurts well above recommended threshold. The sugar content of most types of yogurt is well above the recommended threshold, reveals an analysis of the nutrient content of available UK supermarket products. And organic varieties, often viewed as healthier options, contain some of the highest average sugar content, at 13.1 g/100 g, the findings indicate. Source 6c.
I can imagine that because yogurt is sour when it doesn't have anything added to it but to increase sales they add a ton load of ingredients all in sugar form to make you buy into it and then use words like "Healthy" and "Lose weight". .