If you're healthcare, you're taught not to trust results because it was published under a brand-name journal.

YES, you should be skeptical, but mostly not at the journal-level. You need to be skeptical at the article-level. That is why it's so important to be actually TRAINED to interpret the studies.

The abstract of a trial is like an "advertisement" for the study. You quickly scan it to see if the study is worth reading. If it is, you make multiple passes of the article, identifying biases, understanding the study context, calculating ratios and numbers, reading through the lens of your own practice, and a bunch of other things.