Yes, actually, if someone has direct scientific evidence contrary to the claim (I doubt such evidence exists for your first example as to the best of my knowledge the relationship between beans and gastrointestinal changes is well understood).

Your eyes could hurt for a variety of reasons - brightness, too long screen time, being dry for external reasons, etc. Most humans are poor at identifying the cause of one-off events: you may think it's because you turned on a blue-light filter, but it actually could be because you used your phone for an hour less.

That's why we have science to actually isolate variables and prove (or at least gather strong evidence for) things about the world, and why doctors don't (or at least shouldn't) make health-related recommendations based on vibes.

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To be fair, I should have said something like "claiming software has a health benefit based on vibes/feels". I personally prefer the look of night/dark mode (or whatever you call it) in apps and the browser, but I'm not going to claim it makes me healthier or improves my sleep or whatever.

If you just like how something looks, that's fine, but there's a difference between "I like how X looks" (subjective opinion) than "X helps me sleep better" (difficult to prove but objectively true or false).

Edit: Changed this in my original message as it seems multiple people got confused by my prior poor wording.