For generic and non-branded foods, the app uses the 4-4-9 rule, where carbohydrates and protein are calculated at 4 calories per gram, and fat at 9 calories per gram. This method ensures consistency and accuracy for most entries. However, for branded foods, the app relies on publicly available nutrition labels or data provided directly by manufacturers.

Manufacturers may use different methods to calculate calorie values, which do not always align with the 4-4-9 rule. This can lead to discrepancies between the calorie count and macronutrient values shown in the app.

Rest assured, the app accurately reflects the data entered, and any variations are due to the methods used by food manufacturers.