Eating a variety of foods is the easiest way to ensure good nutrition status. 

If people have difficulty obtain adequate food, this can result in limited variety and nutrient intake, and/or overall insufficient caloric intake.

Eating too many calories is just as bad as not eating enough calories.  The risks for chronic disease risk with increasing BMI. 

People are more likely to have good nutrition status if they have a positive social environment.

Taking a diet history is an easy way to determine nutrition risk.  Diets high in processed foods are more likely to be energy dense, but not nutrient dense.

Nutrient dense

Favors energy balance, contains more fiber and other beneficial nutrients, modest in calories

Energy dense

Provide a substantial amount of calories in the form of added fats and sugars

Not very rich in nutrients or fiber

Associated with overall higher energy intakes