And this is before more localised issues like food deserts, natural disasters, recommendations influenced by industry, etc. Or even other issues like additives, factory farming, sugary drinks being cheaper and safer than the water supplies...
Don't get me wrong, many of us have access to a much larger variety of food from across the world, if we can afford it, the fortification of many foods helps maintain some forms of nutrition, and regulations have made a lot of our food safer. But overall, our produce is worsening in quality and the cheaper per calorie/time foods are what people are forced to eat, and it is killing them.