Nutritional values
Nutritional values are the numbers that tell how much energy and nutrients a food contains. For a ketogenic diet, it is especially fat, protein and carbohydrates that matter.
Calories per gram
Fat provides approximately 9 kcal per gram, while protein and carbohydrates each provide approximately 4 kcal per gram. This is the basis for all ratio calculation: the fat's calories divided by the sum of protein and carbohydrate calories gives the ratio.
Use reliable sources
When you look up nutritional values for raw materials without a declaration (such as fresh fish, fresh vegetables), use Matvaretabellen.no or a similar public database. Be aware of whether the values apply to raw or cooked product.
Variation between products
Even products that look alike can have different nutritional content. For example, the fat level in dairy products varies between brands. Always use the declaration on the specific product you are using, not a general value.