Misleading title, it is not "western diet" what is bad for health, it is fast food, and sugar sweety food what is. What Americans were eating 70-50-30 years ago was healthy and "western". It has been people eating industrial foods instead of someone making the food what has changed. I use to look at obese people shopping cart and I see a lot of Coca Cola, pizza, industrial bread, industrial buns,cookies, chocolate,no…
So, then, what is the "Western diet" if it isn't what the Western people eat? (I see your point, though; it's been changing over time, and you're right: it is getting more and more processed and less balanced {and dare I say "healthy"}). Regarding obesity, exercise is far more important than diet. You can eat all kinds of, well, crap, and if you exercise, you'll still be physically fit and probably even look healthy.…
I say paleolithic "style" diet because I'm not being super strict about it. The main thing I did was totally cut grains and refined sugar out of my diet. I eat fresh meats (mostly beef), eggs, fresh vegetables and low sugar fruits (berries, mostly) and some nuts. I cut dairy as well, except for heavy cream in my coffee and butter which I use for cooking (I also use ghee). I try to avoid seed oils though I do use a olive oil for salad dressing.
I admit I miss good fresh bread but I can't argue with the results.