A saved recipe should use the label for the product actually added. Switching brands while keeping the amount can change nutrition, even when the ingredient name is the same. Update the input before reusing the old portion total.
Calculate the replacement difference
Suppose an invented recipe includes 60 g of a product labeled 90 kcal per 30 g. That input contributes 180 kcal. A replacement label gives 70 kcal per 25 g, so the same 60 g contributes 168 kcal. The recipe’s whole-batch energy decreases by 12 kcal.
If the old batch total was 1,200 kcal, the updated total becomes 1,188. For four equal portions, that is 297 kcal instead of 300. Do not compare the labels’ 90 and 70 directly: their stated portions differ.
Update every supported nutrient
Protein, carbs, fat and other fields may change independently. A 12 kcal difference does not reveal their new values. Replace the ingredient’s compatible nutrient inputs separately, then rebuild the recipe and preserve missing data where necessary.
Keep the version useful
Note the product and label basis beside the quantity so the saved recipe can be understood later. This is an invented arithmetic case rather than a tested recipe or a claim about any current brand. A brand substitution can also change ingredients or allergens, which the macro totals do not certify. Use the new packaging for those questions rather than relying on an old saved label.
Sources and example boundaries
- FDA: serving information
Serving sizes and household/metric units on U.S. labels.
- FDA: food allergies
Ingredient/allergen information requires attention beyond nutrient totals.
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.