Have you been told since childhood that boiled and stewed vegetables are “dead food” with no benefit? Science says otherwise: the fate of vitamins and antioxidants when heated does not depend on the principle of “raw is better”, but on a specific molecule, a specific vegetable and a specific cooking method.
Today I will analyze the 20 most popular vegetables - from those that become more useful in the oven to those that are best eaten raw.
The rating is based on the comprehensive loss of nutritional value during typical home cooking methods - boiling, stewing, frying and baking - compared to the raw state. Cooking in water has the greatest weight, since it is it that washes out and destroys water-soluble substances the most.
What you will learn:
Why lycopene in tomatoes becomes many times more bioavailable precisely after heating - and why this effect almost does not work without a drop of oil.
Why carrots and pumpkins belong to the rare category of vegetables that benefit from heat treatment, not lose.
Why baked potatoes retain significantly more potassium and magnesium than peeled ones.
Why broccoli loses not only vitamin C during cooking, but also the ability to form sulforaphane - due to the destruction of the heat-sensitive enzyme myrosinase.
20 vegetables, real studies from the journals Food Chemistry, Journal of Food Science and USDA FoodData Central data. No horror stories - just chemistry in simple words.
The material is educational in nature and does not replace the advice of a doctor or nutritionist.
Scientific sources:
USDA FoodData Central - Nutrient Composition of Foods
https://fdc.nal.usda.gov
Lycopene from tomatoes - Bioavailability after heat treatment, pilot study in humans (PMC)
https://www.ncbi.nlm.nih.gov/pmc/arti...
Broccoli - Inactivation of myrosinase and loss of ability to form sulforaphane during cooking (PMC)
https://pmc.ncbi.nlm.nih.gov/articles...
Broccoli and mustard seeds - Restoration of sulforaphane formation after cooking (PubMed)
https://pubmed.ncbi.nlm.nih.gov/29806...
Garlic - Effect of heating on antitumor properties and inactivation of alliinase (ScienceDirect / Journal of Nutrition)
https://www.sciencedirect.com/science...
Spinach and beans - losses of folate, ascorbic acid and lutein during cooking and steaming (ScienceDirect)
https://www.sciencedirect.com/science...
Spinach - changes in oxalate, nitrate and lutein content depending on the cooking method (J-STAGE, Food Science and Technology Research)
https://www.jstage.jst.go.jp/article/...
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