“Twice as much” describes the final ratio. “Increased by” describes the extra amount relative to the starting value. Confusing them can turn a simple meal comparison into an exaggerated claim.
Use the starting amount as the denominator
Imagine a listed portion with 200 calories, then a double portion with 400. The multiplier is 400 ÷ 200 = 2. The increase is (400 − 200) ÷ 200 × 100 = 100%. The double portion is 200% of the original amount, but it increased by 100%.
A smaller change
Moving from 200 to 250 calories gives a 1.25 multiplier and a 25% increase. The additional 50 calories are the difference; 250 is the final amount. A sentence that says “adds 250 calories” would be wrong for this example even though 250 appears in the table.
Reverse comparisons use another starting point
Going from 400 back to 200 is a 50% decrease, not a 100% decrease. The denominator is now 400. State the direction whenever you use percentages: “compared with the original portion” is enough to make the claim auditable.
This arithmetic can compare calories, protein or another supported quantity, but it does not by itself judge the meal’s suitability. Keep the portions and units visible. A percentage for a tiny baseline can sound dramatic while the gram difference is small. FDA’s serving guidance supports scaling like-for-like portions; the fictional examples here explain how to describe the resulting difference accurately.
Sources and example boundaries
- FDA: serving information
Serving sizes and household/metric units on U.S. labels.
All food figures and prices in the worked example are invented to explain the method. They are not restaurant nutrition, tested recipes, shopping prices or personal dietary advice. Use the current label for the product you actually have.