What term describes someone's opinion about what people should eat and in what quantities?

The term that best describes someone's opinion about what people should eat and in what quantities is "Nutritional Guideline." Nutritional guidelines are established to provide recommendations for the general public to help them make informed decisions about their dietary habits. These guidelines typically encompass a range of advice regarding food groups, serving sizes, and nutritional content to promote overall health and well-being.

In contrast, dietary reference intakes are scientifically determined values meant to serve as a framework for assessing nutrient intake levels, rather than personal opinions. Food safety standards pertain to the practices needed to ensure the safety and quality of food, focusing on preventing foodborne illness rather than prescribing specific diets. Health recommendations, while related, are often broader statements that may encompass lifestyle suggestions beyond just food choices and quantities, including aspects like physical activity and mental health.