Answer:
Nutritional Adequacy
Step-by-step explanation:
Based on the information provided within the question it can be said that in this scenario Jack is missing the characteristic of Nutritional Adequacy. This term refers to taking in the sufficient amount of nutrients that is necessary, depending on the individual's weight, gender, and height, and age. Which Jack is apparently missing since he needs an intake of 2,800 kilo-calories a day and is only taking in 1,600 Kilo-calories a day.