The guidelines for nutritional labelling have been published by the Codex Alimentarius Commission. This organization, established by the Food and Agriculture Organization (FAO) and the World Health Organization (WHO), sets international food standards, including guidelines on food labeling and nutritional content.
- ISO 14000 refers to standards related to environmental management systems, not food labeling.
- ISO 9000 is a set of quality management standards that focus on improving organizational quality but does not specifically deal with nutritional labelling.
- ISO 22000 is concerned with food safety management systems, ensuring that food products are safe for consumption, but it doesn't specifically set guidelines for nutritional labelling.
Thus, the correct answer is option (3): Codex Alimentarius Commission.