A smaller number may look attractive, but do both labels describe the same amount? Start with the measurement basis before comparing sugars, protein or carbohydrate.
Write down the basis
Check whether values are per 100 grams, per serving or per pack, then note the serving weight. Figures for a 20-gram serving and a 40-gram serving cannot be compared directly.
A fictional comparison
Snack A has 12 grams of carbohydrate per 30-gram serving. Converting to 100 grams gives 12 ÷ 30 × 100 = 40 grams. Snack B lists 35 grams per 100 grams. The comparison now uses the same basis. These invented numbers illustrate the method, not store product data.
Calculate the amount eaten
A 15-gram portion of snack A provides 12 × 15 ÷ 30 = 6 grams of carbohydrate. Per-100-gram values describe composition; the actual portion describes what is eaten.
Compare more than one number
Review ingredients, sweeteners, allergens, pack weight and price as well. Different flavours or uses may influence the choice.
Make a shopping note
Record the label basis, serving weight and planned amount. Request a clear label instead of guessing missing information. For a child with diabetes, follow the counting method agreed with their care team.
Save the example for your next comparison.
Reference: FDA — https://www.fda.gov/food/nutrition-education-resources-materials/nutrition-facts-label
Write down the basis
Check whether values are per 100 grams, per serving or per pack, then note the serving weight. Figures for a 20-gram serving and a 40-gram serving cannot be compared directly.
A fictional comparison
Snack A has 12 grams of carbohydrate per 30-gram serving. Converting to 100 grams gives 12 ÷ 30 × 100 = 40 grams. Snack B lists 35 grams per 100 grams. The comparison now uses the same basis. These invented numbers illustrate the method, not store product data.
Calculate the amount eaten
A 15-gram portion of snack A provides 12 × 15 ÷ 30 = 6 grams of carbohydrate. Per-100-gram values describe composition; the actual portion describes what is eaten.
Compare more than one number
Review ingredients, sweeteners, allergens, pack weight and price as well. Different flavours or uses may influence the choice.
Make a shopping note
Record the label basis, serving weight and planned amount. Request a clear label instead of guessing missing information. For a child with diabetes, follow the counting method agreed with their care team.
Save the example for your next comparison.
Reference: FDA — https://www.fda.gov/food/nutrition-education-resources-materials/nutrition-facts-label
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