Walk into any grocery store today, and it feels like everything you could ever want is right there under fluorescent lights. But if you’d wandered those same aisles a few decades ago, you’d have spotted things that just are not there anymore. These products simply stopped showing up one day, and most of us didn’t even notice until we went looking for them. From snack foods that got quietly reformulated out of existence to household staples that lost the shelf-space battle to newer competitors, these disappearances tell a story about changing tastes, changing regulations, and changing times. Here are 15…