Disclosed is a method of producing a soy protein product having a soy protein content which includes: (a) extracting a soy protein source with an aqueous calcium salt solution, (b) separating the aqueous soy protein solution from residual soy protein source, (c) optionally concentrating the aqueous soy protein solution while maintaining the ionic strength substantially constant by using a selective membrane technique, (d) optionally diafiltering the concentrated soy protein solution, and (e) optionally drying the concentrated and optionally diafiltered soy protein solution, wherein the method further comprises a further heat treatment step to precipitate the soy protein product and a drying step
