I dont think it is fair to discard the value of calories in a discussion of efficiency in food production.
Milk is a staple of many American diets, maybe as a result of the Got Milk Yada Yada, my point being drinking a cup of milk is going to fill you up with x calories, weather you would have replaced it with 4 cups of almond milk or not.
If you decided not to drink cow milk, and only had 30 calories from the single cup of almond milk you drank, the 90 calories you are missing will be made up elsewhere in your diet, potentially in a more inefficient replacement food.
Sure, food scarcity is not the tightest conversation in America due to the prevalence of our high calorie diets, but in terms of human dietary habits as a whole, calorie density, difficulty of obtaining, and difficulty in distribution are desperate conversations that lives depend on.