Why does it always have to be the consumer’s job to watch out for this crap? It’s exhausting going through everything looking for allergens, imagine doing so just to make sure the product you’ve been buying for years hasn’t changed to lower quality without warning.
Better solution - require that products have a front label stating their recipe has changed, and including a list of changes to it on the back. Quicker reference, easy as hell to tell when something changed.
Consumer protection really needs to be more robust. We shouldn’t let these companies have all the power to mess with our bodies on a whim without warning.