Q. When I'm entering nutritional info for an ingredient, does it have to be a 100g nutritional?
A. Not necessarily. You can enter nutritional data for the gram weight that is provided by your data source. For example, if your source provides data per 40 gram serving, you can enter 40 grams, and then list the nutrients in their appropriate columns.
For some ingredients, 100g data might provide more detail than would the serving size (especially if the serving size is 5g, and nutrients round down to zero).