I ought to be able to make a low-effort glance into the things I eat and pick a diet that closely matches my intuitions without sacrificing health, happiness, or undue money
I'm not sure what sense of "ought" you're using there, but that seems like you're expecting an implausibly cooperative universe. Your ethical intuitions might be in line with what you need for health, but they are only loosely affected by health considerations.
There's some pull towards ethics leading towards diets which are livable for a high proportion of people who follow them, but that's hardly a guarantee.
Warning: I eat meat, so this might be motivated reasoning. On the other hand, the health claims for vegetarianism also seem to me like motivated reasoning.
"Ought" meaning that I think it's highly unlikely that these calculations come out in such a close race that I don't have clear choices despite using low powered analysis. It might, but like, if the mussels thing looks very likely true, that for example would be a big differentiator over certain other products. Also, there is some variation between brain size and food value. If something IS a close call, there are lots of things that almost certainly are not. That's what I mean by "ought"
One person does not have a large effect on mark...
Previous open thread
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one.
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.