system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do chia seeds turn slimy when you mix them with liquid?

Is this a seed thing or specifically a chia thing? If it's a seed thing, what other seeds can I use to make pudding?
gpt
It's caused by mucilage, which is a gel-like polysaccharide coating common to (almost) all plants, albeit not always in useful quantities. Vinaigrette dressings are emulsified with the mucilage from mustard seeds, for example, while flaxseed mucilage is a common vegan egg substitute. It's also commonly found in plant roots.

In theory you could make pudding with almost any seed, although mustard seed pudding might not be particularly palatable.