Portion analysis
Serving total and calorie density answer different questions
Every selected record uses a 240-gram source amount, so serving-weight differences do not explain the calorie spread inside this set. Their own source servings run from 134 calories for “multigrain” to 310 for “instant, plain, made with milk, fat added.” At a fixed 100 grams, “multigrain” is 56 calories and “instant, plain, made with milk, fat added” is 129—a fixed-weight separation of 73 calories. For Oatmeal, the serving view answers “how much is in the database portion?”; the 100-gram view answers “how concentrated is the matched record?” Neither reveals how many grams were actually eaten.
The scaling rule: multiply a per-100-gram value by eaten grams ÷ 100. The arithmetic is exact; the result is only as defensible as the record match and portion estimate.
Preparation analysis
The long description carries the evidence
The published descriptions distinguish forms such as “multigrain”, “instant, plain, made with water, no added fat”, “instant, plain, made with non-dairy milk, no added fat”, “regular or quick, made with milk, no added fat”, and “instant, plain, made with milk, fat added”. The source formulations contain 10 distinct ingredient codes; examples that appear in only part of the set include beverages, water, tap, drinking, cereals, oats, instant, fortified, plain, dry, salt, table, and cereals, oats, instant, fortified, maple and brown sugar, dry. On this Oatmeal page, those rows make the records inspectable, but they are not a controlled experiment: they cannot tell us that one named input, by itself, caused a nutrient difference.
Database precision is not meal certainty. Retain the exact description beside the number so later corrections remain possible.