Energy Yield from Substrate Oxidation

What is this formula?

This formula calculates the amount of energy released when a given mass of a biological substrate is oxidized. The parameter Y represents the specific energy yield of the substrate.

Typical values are:

Carbohydrates: approximately 4 kcal/g

Proteins: approximately 4 kcal/g

Fats: approximately 9 kcal/g

Alcohol: approximately 7 kcal/g

When to use it

Use this formula to estimate caloric production from nutrient metabolism, dietary analysis, exercise physiology, and energy balance calculations.

Example

A person metabolizes 50 g of fat.

Data:

m = 50 g

Y = 9 kcal/g

Formula:

E = mY

Substitution:

E = 50 × 9

E = 450 kcal

Result:

Energy released = 450 kcal

Applications

- Nutrition analysis

- Calorie calculations

- Sports nutrition

- Metabolic studies

- Diet formulation

- Energy balance assessment

Note

This formula is an approximation based on average physiological energy yields of nutrients. Actual energy extraction may vary depending on digestive efficiency, metabolic pathways, health status, and measurement method. Different nutritional systems may report slightly different caloric values for the same substrate.