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Sunday, 1/3/2026 | 11:01 GMT+7

5 facts about green vegetables you need to know before eating

Green vegetables are rich in vitamins, minerals, and fiber, but their oxalate content can hinder the body's absorption of minerals.

Low in calories

Green leafy vegetables are packed with vitamins A, C, K, and folate, alongside minerals such as iron, calcium, and magnesium, all while being low in calories. This combination supports weight management and boosts cardiovascular and bone health. However, relying solely on vegetables without adequate protein and healthy fats can lead to nutritional deficiencies.

Oxalates affect mineral absorption

Certain green leafy vegetables, such as spinach, contain high levels of oxalates. This natural compound binds with calcium and iron, thereby reducing their absorption in the body. Individuals with sensitivities, particularly those with a history of calcium oxalate kidney stones, face an increased risk of stone formation if they consume large amounts of oxalate-rich foods.

High fiber content

The fiber in green leafy vegetables aids digestion, promoting gut balance through regular bowel movements. However, individuals with sensitive digestive systems may experience bloating and abdominal discomfort from consuming large quantities of green vegetables, due to their complex carbohydrates and high fiber content.

Adults need an average of 20-38 g of fiber daily for optimal digestive health. Specifically, females require about 25 g, while males should aim for around 38 g per day. Children aged 3 and above need about 19 g, with their requirements increasing progressively with age.

Risk of pesticide residues

Green vegetables can contain pesticide residues if production standards are not met. Thoroughly washing vegetables under running water, soaking them, and proper preparation significantly reduce these residues. Opting for trusted vegetable sources, certified safe products, or home gardening can also minimize exposure to chemicals.

Cooking can enhance nutrient absorption

While raw vegetables offer health benefits, certain nutrients, such as beta-carotene and iron, become more readily absorbed after cooking. For instance, lightly stir-frying spinach releases more iron and antioxidants compared to consuming it raw. However, it is important to avoid overcooking, as this can result in the loss of water-soluble vitamins like vitamin C.

Le Nguyen (According to Times of India)

Readers can send nutrition questions here for a doctor's answers.
By VnExpress: https://vnexpress.net/5-su-that-ve-rau-xanh-can-biet-truoc-khi-an-5045073.html
Tags: vegetables nutrition green vegetables

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