Final answer:
The USDA recommends that the smallest portion of our diets should be oils, especially those high in solid fats and added sugars, within the framework of their MyPlate guidelines. These are to be consumed sparingly to maintain a nutrient-rich and calorie-controlled diet.
Step-by-step explanation:
The USDA recommends that the food category which should make up the smallest percentage of our diet is oils, particularly those high in solid fats and added sugars. This is evident from the MyPlate guidelines provided by the USDA which suggest that nutrients to be consumed in moderation include unhealthy fats, sodium, and added sugars. These components are of particular concern for public health in the United States. The USDA's MyPlate visually indicates that the majority of your diet should consist of fruits and vegetables, with grains, proteins, and dairy products comprising the rest in recommended proportions. Oils are not represented as a separate food group on the plate, implying that they should be used sparingly.
The aim is to promote a balance where individuals meet nutritional needs without exceeding calorie limits, choosing a diet rich in nutrient-dense foods. Foods with low nutritional value, particularly those high in solid fats, added sugars, and sodium, such as certain snacks, sweets, and processed foods, should be consumed in the smallest quantities for optimal health according to the guidelines.