Those diets also didn't have added sugars and salts to everything. It's serious work requiring reading all the nutrition labels to get groceries sans questionable additives in the US.
Thanks to corn subsidies, we have high fructose corn syrup in many foods you wouldn't expect to find it. Milk by-products are the same way. My wife recently developed lactose intolerance, so we've been finding milk products in tons of things you wouldn't have expected it. Instant ramen? The flavor mix includes milk solids. Cheap hot dogs? More milk solids. Flavored chips, even when not cheese flavored? They have lactose too. Many brands of chicken nuggets or fish sticks? Milk is everywhere! We subsidize some of these industries to the point of over production which leads to companies finding "clever" ways of utilizing that excess often to the detriment of the population at large.
Have you tried A2 or Raw milk? I’m sensitive and those changed things. I like A2 since I can get it at Target, and I have no problems with Raw milk. Consuming those before say cheese or ice cream or pizza helps massively.
The rise of transnational food companies helped make this an almost ubiquitous global development in developed nations, the growth of obesity in our neighbor to the south Mexico over the last 40 years or so is a pretty good example.
