What you really need are the grams of carbohydrates (diabetics and dieters can actually use that information) and possibly the fat content ~ although that needs to be divided up into a number of categories to inform people with specific conditions of what they need to know.
Protein might be useful ~
Calories is still a significant factor if you are wanting to lose weight. Not everything can be based upon protein vs carbs vs fats. Not all calories are the same either. To lose weight properly(1-2 lbs max per week) the accepted rule is to eat 500 calories below your maintence level and you need to know your maintence level.
I eat 3300 cal per day when not lifting(cardio only) and 3600 per day on my lifting days and really watch my macros-more good carbs on lifting days for peak energy.