Compare old and new labels before calling a change a reformulation
Use dated package records, equal-weight calculations, and a narrow conclusion to separate recipe changes from serving changes.
A new number on a package can reflect a changed serving, a different product variant, updated information, or a changed recipe. Comparing two dated labels is a good starting point, but the numbers alone do not identify the cause.
The FDA label-reading guide explains the importance of serving information. In a before-and-after record, preserve that information for both versions rather than assuming the serving stayed constant.
Build a dated comparison record
For each package photograph, record product name, flavor, market, package size, and date photographed. Keep the original image. If a manufacturer identifies a version or batch, retain that too. Do not compare an old online image with a current package without noting the different evidence sources.
Imagine a fictional earlier label lists 240 mg sodium per 40 g serving. A newer label lists 180 mg per 30 g. Both calculate to 600 mg sodium per 100 g. The lower new serving figure is fully explained by the smaller stated serving in this example.
Identify a concentration change separately
Now suppose the newer label instead lists 150 mg per 30 g. Its calculated concentration is 500 mg per 100 g, compared with the earlier 600 mg. The displayed values imply a decrease of 100 mg per 100 g, or approximately 16.7% relative to the earlier value.
That supports a statement about the two declarations. It does not by itself prove that a particular ingredient was removed or that every package on shelves already uses the newer formulation.
Check the ingredient evidence without inventing quantities
Read both full ingredient lists and preserve their exact wording in your private comparison notes. A changed ingredient name or order can be worth investigating, but do not calculate ingredient percentages from order alone. Ask the manufacturer when the relationship between the two packages is unclear.
Also check preparation instructions and whether either nutrition panel describes prepared food. A change in the assumed milk, dilution, or portion state could explain a changed declaration without establishing a change to the product as sold.
A restrained final note might say: “These dated packages declare different sodium concentrations at equal weight; the cause has not been independently confirmed.” That is more defensible than presenting a formula change as a proven fact from two cropped numbers.