study is slightly horked
I suspect cherry picking but dont see a reason for it. 1974 is not a year that would indicate a surge of niacin and fortified grains. They have been the same since circa 1960. Consumption of carbs didnt pick up in 1974, in fact that would probably be about the time that people started seriously looking at their diets and experimenting more with non standard items. The only sea change I would see using 1974 is that anti smoking campaigns were really starting to make an impact. So perhaps the obesity problems, using the same population and time frame can show that lack of nicotine in the population caused a surge of obesity and therefore diabetes. So when the family doc in 1950 told you to start smoking to lose weight, he was right.
Any opinions expressed by me are mine alone, posted from my home computer, on my own time as a free American and do not reflect the opinions of any person or company that I have had professional relations with in the past 55 years. meep