"Yes, we Americans overeat beef / Hamburgers, but I don't think anyone eating burgers is at huge risk of malnutrition... as much as a risk of heart problems, diabetes, cholesterol, etc. etc."

Pretty strongly disagree here. US Beef consumption is about the same as in early 1900's, which was a time where personal health in several metrics was far better. (Weight being the obvious one)

Always very skeptical when people talk about cholesterol, it's a really nuanced topic, but the average person seems to be stuck in the 1970's with "cholesterol bad". Thinking high ldl is always bad is only slightly better.