Recipe yield and nutrition: what changes after cooking?

What does recipe yield mean?

Recipe yield is the amount of finished food produced after preparation or cooking. In nutrition calculation, yield is often expressed as the final weight of the prepared recipe or as a yield factor comparing final weight with starting weight.

FAO training material defines a yield factor as the percentage weight change caused by cooking and recommends measuring it where possible.

Weight loss is not the same as nutrient loss

A common mistake is to treat every gram lost during cooking as if the same percentage of nutrients disappeared. That is not what yield represents.

For example, roasting may remove water. If the recipe loses water but retains most of its protein, carbohydrate and fat, those nutrients become more concentrated per 100 g of finished food.

Why nutrients per 100 g can rise after cooking

Imagine a recipe contains 2,400 kcal in total and finishes at 2,400 g. That equals 100 kcal per 100 g. If a similar batch loses water and finishes at 2,000 g while total energy remains about 2,400 kcal, the finished food is now about 120 kcal per 100 g.

The recipe did not gain energy. The same energy is distributed across less finished weight. This concentration effect is one reason final yield matters so much when a menu or nutrition report uses a per-100 g basis.

Where retention factors fit

Retention factors are used for nutrients that may be reduced or otherwise changed by cooking, storage, processing, reheating or holding. FAO/INFOODS recipe methods treat them separately from yield factors.

The appropriate retention approach depends on the nutrient, food and preparation method. Not every nutrient requires the same treatment, and published factors are not available for every food.

• Yield factor: weight change.
• Retention factor: proportion of a nutrient retained.
• Edible coefficient: adjustment for inedible portions where relevant.

A practical kitchen workflow

For a restaurant or hotel recipe, record starting ingredient quantities, cook the batch using the normal production method, then weigh the finished usable recipe. Record drained or discarded components consistently.

If the recipe is regularly produced in different batch sizes, compare several actual yields. Large variation can indicate a production-control issue as well as a nutrition-analysis issue.

• Use the same containers and weighing method where possible.
• Define whether sauces, cooking liquids or drained fats remain part of the final dish.
• Recheck yield after major recipe, equipment or cooking-method changes.