Final answer:
The set of principles designed to reduce the risk of chronic disease by the USDA and USDHHS is called the Dietary Guidelines for Americans, which is updated every five years.
Step-by-step explanation:
The set of principles developed and updated every five years by the USDA and the USDHHS to reduce the risk of developing chronic disease is known as the Dietary Guidelines for Americans. The intent behind these guidelines is to inform the public about healthy eating patterns and to provide nutrition advice to help individuals live healthier lives and reduce the incidence of chronic diseases such as heart disease, diabetes, and obesity. The guidelines not only focus on nutritional choices but also on the importance of maintaining an active lifestyle and managing calorie intake for energy homeostasis.
History of Food Guidance in the U.S.
Prior to these current guidelines, the government has provided food and nutrition guidance through various tools over more than a century, including "The Four Food Groups", "The Food Guide Pyramid", and most recently "MyPlate". The development of such guidance is based on the evolving scientific understanding of nutrition science and its impact on public health.