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Traffic-Lights & Simplified Portions 

The Heinz Beans example shown below demonstrates how nutritional values can also be displayed in a consumer-friendly format, relying on graded values rather than absolute values.   

The total food energy value, expressed as "calories", is the primary visual indicator, using a traffic-light scale to indicate the three relative bands of low, medium [mid] and high.  

The coloured calorie traffic-light is underpinned by white traffic-lights to display the three main  macronutrients of fats, proteins, carbs, on the same high-low basis. The % weight [gram] values are converted to % energy [calorie] values using the accepted conversion formula.

The main health-micronutrients are displayed separately for emphasis. 

All scales are calculated against descending value-sorts drawn from all known measured foods. 

In addition, a 10-point scale measures the actual banded values against known  portion sizes to show a "simplified portion value". This provides a more precise indicator than the traffic-light. It also provides an option for daily counting applying a similar principle to the "unit" counting systems of some diet groups

Scale values and average portions are derived from the UK nutrient databank cross-referenced to  the the US nutrient databank. 

Traffic lights and simplified portion values [10-point scale]: