Although Alfonzo doesn't like many kinds of vegetables, he is willing to eat more servings of nutrient-dense, raw leafy vegetables each day. According the the USDA, Alfonzo can count as a serving of a vegetable.

2 cups of raw spinach

Explanation:

USDA means United States Department of Agriculture, and it is in the management of food, agriculture, nutrition and natural resources programs.

In the aspect of food, it has a section known Food services and inspection service which is empowered to inspect and ensure that poultry and processed food supply is safe and labelled properly. This is done in order to ensure the  safety of American people.

Another agency is Food and Nutrition Service, FNS, which works towards of eradicating malnutrition in the country. This is by making sure that people eat necessary food diets to prevent malnutrition.

In this case, Alfonzo will need to be taking 2 cups of raw spinach, to help him to have the necessary nutrients.  This is because, the spinach is a leafy vegetable that is known to have high amount of nutrients and antioxidants.