busyThere is a high degree of inaccuracy in studies to begin with. Among the most ubiquitous flaws are bad sampling and poor research design. This isn't a matter of one bad lab or university or journal. It's the system. This becomes especially obvious in secondary research, where a collating study may throw out many previous studies in its topic range due to visible flaws, poor recordkeeping, and related issues.
You can deal with this yourself by triangulating data. Anything that has not been replicated should be considered a point of interest, not a fact. You need at least 3 solid studies to consider something even somewhat reliable. And remember that a lot of advice gets reversed 5-10 years down the line anyway.
