Health wise , so much we are told turns out to be upside down.
Say, chlosterol. In 1977 the Framingham Study told us higher HDL levels and lower LDL levels are associated with a reduced risk of coronary heart disease. Not to mention later studies showing statin lowers LDL not only coronaries but other cardiovascular diseases and even stroke (10.1002/14651858.CD004816.pub5). Well, turns out higher cholesterol only correlates with heart disease under 50 years old. Damning it all is a 2016 study showing above 60 actually higher LDL correlates with longer life... And then it turns out though niacin brings down your cholesterol but has no effects on cardiovascular events. And then Pfizer abandoned a drug which raised HDL -- but actually raised the risk of such events. Whopsie! https://www.nytimes.com/2006/12/03/health/03pfizer.html The whole good/bad cholesterol thing is total, absolute bunk science proven wrong multiple times from multiple angles. (Hope I didn't get wrong the various lower/higher things.)
Also, in general, evidence is mounting that all food related studies are useless simply because humans with different genomes (surprise!) react differently to food and we do not understand yet which genes correlate with which food causing what. I mean, this makes so much sense, imagine that someone asserted that seven billion beings with different genetic composition reacts the same to all foods. That's absolutely laughable and yet, you are getting these advices of what to eat and what not to eat in general. What is beginning to become clear is that we do not know anything at all about how humans react to the food they intake. First we started with trying to see how they react to "fats", "carbohydrates", "proteins" and so on. But turns out foods are not just those but also vitamins and then it turns out no matter how you put together fats, carbohydrates, proteins and vitamins it still won't resemble anything food like. We go to smaller and smaller components trying to find the composition of food -- but it just doesn't work. So you have an unknown on the food end and another unknown on the human end and yet we are told to follow certain diets. Which of course change every decade or so when it all falls apart.
Say, chlosterol. In 1977 the Framingham Study told us higher HDL levels and lower LDL levels are associated with a reduced risk of coronary heart disease. Not to mention later studies showing statin lowers LDL not only coronaries but other cardiovascular diseases and even stroke (10.1002/14651858.CD004816.pub5). Well, turns out higher cholesterol only correlates with heart disease under 50 years old. Damning it all is a 2016 study showing above 60 actually higher LDL correlates with longer life... And then it turns out though niacin brings down your cholesterol but has no effects on cardiovascular events. And then Pfizer abandoned a drug which raised HDL -- but actually raised the risk of such events. Whopsie! https://www.nytimes.com/2006/12/03/health/03pfizer.html The whole good/bad cholesterol thing is total, absolute bunk science proven wrong multiple times from multiple angles. (Hope I didn't get wrong the various lower/higher things.)
Also, in general, evidence is mounting that all food related studies are useless simply because humans with different genomes (surprise!) react differently to food and we do not understand yet which genes correlate with which food causing what. I mean, this makes so much sense, imagine that someone asserted that seven billion beings with different genetic composition reacts the same to all foods. That's absolutely laughable and yet, you are getting these advices of what to eat and what not to eat in general. What is beginning to become clear is that we do not know anything at all about how humans react to the food they intake. First we started with trying to see how they react to "fats", "carbohydrates", "proteins" and so on. But turns out foods are not just those but also vitamins and then it turns out no matter how you put together fats, carbohydrates, proteins and vitamins it still won't resemble anything food like. We go to smaller and smaller components trying to find the composition of food -- but it just doesn't work. So you have an unknown on the food end and another unknown on the human end and yet we are told to follow certain diets. Which of course change every decade or so when it all falls apart.