The secondary research process involved comprehensive analysis of food regulatory databases, peer-reviewed nutrition and food science journals, agricultural commodity reports, and authoritative food industry organizations. Key sources included the US Food & Drug Administration (FDA), US Department of Agriculture (USDA) National Agricultural Statistics Service, European Food Safety Authority (EFSA), Health Canada, Food Standards Australia New Zealand (FSANZ), Japan Ministry of Agriculture, Forestry and Fisheries (MAFF), Food and Agriculture Organization (FAO) of the United Nations, World Health Organization (WHO) Nutrition Database, Soyfoods Association of North America (SANA), European Natural Soyfood Manufacturers Association (ENSA), Japan Tofu Association, International Food Information Council (IFIC), National Soybean Research Laboratory, USDA Foreign Agricultural Service (FAS) Global Agricultural Trade System, Euromonitor International, Passport GMID, and national statistics bureaus from key soy-producing and tofu-consuming markets. These sources were used to collect production and consumption statistics, soy commodity pricing data, organic certification standards, food safety regulations, dietary guideline trends, import/export trade flows, and competitive landscape analysis for organic tofu, conventional tofu, silken tofu, firm tofu, and processed tofu products.