So im not even sure soybeans have zero. The thing with beans is fiber and protein is by far the largest component. So net carbs and blood sugar spikes and such should not be an issue. whole grains have more starch but again the fiber vs starch thing they are favorable with many. If you really need close to zero starch. like less than 1%. then seeds and leafy greens I think are basically what you are stuck with but the greens won't exactly bulk you up and im not sure how many seeds you could eat. Most seeds are basically fiber, protein, and fat. Some nuts to. Like hazelnuts. Again though absolutely zero starch is going to be virtually impossible unless you just eat processed stuff that removes it.