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How the Caloric Content of Food Changes After Cooking

28 octombrie 2025

3 min de lectură

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The nutritional value of a raw product is not difficult to find out. However, the caloric value changes when the food is cooked, making calculations difficult. Let's look at this more closely!

Concluzii cheie

The nutritional value of a raw product is not difficult to find out.
How does the weight of food change?
How is calorie content affected by different cooking methods?

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Persoane care explorează Weight loss prin intermediul healthy lifestyle, healthy eating.

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Autorul articolului

Dr. Mariyat

Nutritionist

How does the weight of food change?

Various factors can influence the final volume and weight of food when it is cooked.

Water absorption: Foods such as buckwheat, rice, and pasta swell during the cooking process, lowering the caloric content of the finished product.
Water loss: Protein products (meat, eggs, fish, etc.) change texture during cooking. When exposed to heat, eggs begin to curdle, and the muscle fibers in meat and fish denature, decreasing their weight.
Additional ingredients: Leavening agents used in cooking, such as yeast, increase the content of carbon dioxide, which lingers in the dough during baking. Its volume increases accordingly.
Cooking time: Prolonged heating reduces food's moisture content (and weight).
Added cooking fat: Cooking with fat increases the caloric content of food (1 g of fat contains 9 kcal). Fat is easily absorbed by food and significantly increases its weight during cooking.
Vegetables and fruits (except starch-containing fruits): These decrease in volume, which decreases the calorie count.

Vegetables should be cooked gently because the glycemic index increases when vegetable fibers are broken down. It is recommended that vegetables be heated to 140–158 °F, or they can be cooked in a steamer to 176–194 °F within five minutes. In boiling water, cook for no more than three minutes.

Legumes absorb water and significantly increase in size, while the caloric value per 100 grams of the cooked product decreases.

Dairy products usually do not have weight changes when heated, but their calories increase.

How is calorie content affected by different cooking methods?

Cooking is the main factor that determines the caloric content of dishes.

Cooking in boiling water reduces calories by almost 20 %, as excess fat, sugar, and protein are lost. But there are exceptions, such as starchy vegetables like potatoes, carrots, and beets. When boiled, their calorie content increases by about 30 % as the starch is modified and gives additional calories.
Grilling and baking are also healthy ways to cook meat, as grilling drains fat and reduces calorie content.
Frying in oil increases the calorie content of the dish. However, frying food in a dry pan can decrease the product's calorie content.
Stewing is similar to boiling‒only the calories do not go into the broth but into the gravy.
Steaming is the most useful method as it reduces calories and preserves vitamins.

From theory to practice

Let's see how the nutritional value of common foods changes.

Product	Raw product (100 g / calorie)	Cooked (100 g / calorie)
Potatoes	58	~ 180 fried ~ 150 fried ~ 140 baked ~ 110 boiled
Buckwheat	305	~ 100 boiled
Chicken breast	113	~ 95 boiled ~ 100 grilled ~ 230 fried
Beef	187	~ 254 boiled ~ 232 stewed ~ 175 baked
Salmon	150	~ 185 boiled ~ 190 steamed ~ 200 grilled ~ 270 lightly salted
Pasta	350	~ 175 boiled
Chickpeas	390	~ 195 boiled
White rice	344	~ 116 boiled

Boiled egg has almost no calorie change and may only increase slightly with prolonged cooking.

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