That's only possible because the science itself is difficult.

I think you are being generous. The science behind cigarettes isn’t difficult and yet the industry was able to obfuscate for too long. It happens all the time and there are many, many examples. Climate change is another recent one.

Climate change science is super complicated.

Cigarettes was pretty clear pretty fast, they resorting to hiding the research, it was much more difficult to obfuscate it.

> That's only possible because the science itself is difficult. So was (and still is) landing a man on the moon, but we still managed to do it. Difficult doesn't have to mean "impossible" and accepting wrong/bad results just because getting the right results is hard, is plain stupid, at best. The vested interests of multi-billion $$ corps who often directly and indirectly fund the said "researches" make it hard to take lot of research at their face values. There is good reason to question your doctor and nutritionist, out of genuine concern for your own health and well-being. And if a doctor is not open to questions or addressing our concerns sufficiently, we should be on the lookout for a better doctor.

It's difficult because it's hard to know what assumptions are correct.

With practical matters putting a man on the moon it's easy to figure out who's wrong and right.