That same 50 years of science have led to the biggest obesity epidemic in history.
The scientific literature recommending a low fat diet, incentivized the food industry to reduce/remove fat from their products, but then they had to compensate for the loss of flavour by adding sugar and other flavour enhancers. Fat is also filling, and by removing it, people need to eat more in order to feel full.
The average woman in the US today weighs as much as the average man did 50 years ago [0]. Changes in nationwide dietary habits, due in part to scientific literature over the last 50 years, bear some responsibility for that.
0: https://www.washingtonpost.com/news/wonk/wp/2015/06/12/look-...