The animal feed industry remains largely dependent on soy and fishmeal. However, these two sources present serious hurdles to sustainability due to environmental pressures, supply risks, and rising costs. The industry is no longer just looking for "more protein," but for "smarter protein sources." Alternative proteins, especially insects and single-cell proteins (SCPs) produced by microorganisms, are at the heart of this transformation. Yet, the value of these sources is no longer determined solely by production efficiency, but by the extent to which they contribute to the circular economy. Insect farming, in particular, stands out for its potential to convert food...