Oh, so cool, from first impressions it looks like solid good scientific method at work:

- 200 participants, which is not super many, but already something to at least start talking about in terms of statistics & non-fluke probability;

- your gold standard of: "put forward a theory, then run an experiment that can falsify it" (vs. e.g. retroactive)

- according to the article's title, randomized, double-blind, and placebo-controlled.

I didn't read the actual article, and I'm not a scientist myself or good enough in statistics to be able to validate it further for no errors, but the initial signals already make me so happy that in nutritioning there are people trying to do good science! <3