For a vegan diet, I&#x27;d prefer chia seed over flaxseed.<p>Its greatest advantage is that the seed does not need to be milled (exposing the oils inside to light and oxygen) to be digested.  Second, it has more of that mucilaginous fiber coating than flax, making beverages such as chia fresca possible.  Third, I just like the flavor better.  The disadvantage is cost per kg.  Chia still costs more than flax.<p>But one need not pick just one or the other; they&#x27;re both excellent foods.<p>Non-vegans can go lower on the food chain than fish oil by eating krill oil.  Krill are only one step up from algae.  In theory, krill-based foods could be farmed more sustainably than fish, but in practice, most of the wild krill catch is fed to fish farms.  If krill were more popular as a direct-to-human food, there might be more financial incentive to farm it rather than catch it wild.