A method of growing fungal mycelium and forming edible food products includes growing fungal cells in a growth media such that the fungal cells produce mycelium. The growth media includes a sugar, a nitrogen-containing compound, and a phosphate-containing compound. The mycelium is separated from the growth media. The mycelium is concentrated to obtain a fibrous mycelium mass having a protein content of greater than 40 wt % of a dry mass of the mycelium. Food additives can be added to the fibrous mycelium mass to produce a biomass. The biomass can be formed into an edible food product. The biomass can be formed into an edible meat substitute product.
