This is basically the first thing asked by the layman when these types of observations emerge.

The replies will almost certainly be regurgitated into a misleading article, which in turn will kick off a damaging trend.

We don’t know is the answer. However, if you were coral, then I would suggest increasing the amount of symbiotic algae, which stimulates mucin secretion (probably a nutrient boost).

A brain normally doesn’t receive enough sunlight for this strategy to work for humans.

It's a fair and good question.

From "Endothelial Glycocalyx Preservation — Impact of Nutrition and Lifestyle" (2023) [1]:

Vitamin D; omega-3 supplementation; dietary sulfur (onion, garlic, leek, kale, broccoli, cauliflower, cabbage...); intermittent fasting

(edited for formatting)

[1] https://pmc.ncbi.nlm.nih.gov/articles/PMC10255458/

Prebiotics like Akkermansia help improve the mucin layer in the colon. Lower amounts of these beneficial bacteria actually contribute to gut health. The weird part is Akkermansia actually eats the mucin layer. You would think that would cause a less dense mucous layer, but the presence of Akkermansia actually causes goblet cells in your gut produce more mucin which strengthens the mucous layer. We also know that gut health can and does affect the nervous system.