The corporations fund their own research which shows exactly what they want it to show, the government picks/funds certain research which shows exactly what they want it to show, they all claim it is "science", but everything contradicts everything else, leaving people confused. Meat is good, but meat also causes cancer? Fat is good but fat also causes heart attack? Salt is good or salt is bad? Doesn't make sense.
Since they are so confused they start saying "everything in moderation", which translated means "we don't have a clue".