You'd be amazed at the products which now contain yogurt, for example. Chocolates, crisps, pizzas.
that explains why they are taking it out of yoghurt. Even the premium brands (eg Rachel's) now have starch - tapioca or rice starch, for example - on the list of ingredients. This is because it's cheaper to add starch than to add milk solids, or ferment it for longer, or sieve it to create a thicker yoghurt. The result is a food with the consistency of Angel Delight, but still with a premium organic price. I noticed the change in the consistency, before checking the label and finding out it was now artificially thickened.
Oddly, almost all plain yoghurts are just milk and culture, but as soon as they add fruit, they add lots of other, unnecessary ingredients.
Rather than reading ingredients, I try to buy things that don't have lists of ingredients. Americans call it
shop the perimeter, but UK stores aren't laid out like that.