Steaming vegetables generally retains more nutrients than boiling because it minimizes the vegetable's contact with water, preventing nutrient leaching.
When vegetables are boiled, water-soluble vitamins like Vitamin C and B vitamins, as well as minerals, can leach out into the water. The longer the vegetables are boiled and the more water used, the greater the nutrient loss. Steaming, on the other hand, cooks vegetables using steam rather than direct contact with boiling water. This significantly reduces the amount of nutrients that are lost through leaching. The vegetables are placed in a steamer basket above boiling water, allowing them to cook gently without being submerged. This method helps to preserve the vitamins, minerals, and antioxidants present in the vegetables, resulting in a more nutritious final product. Some nutrients are still lost during steaming, but the losses are generally lower compared to boiling.
Regardless of whether you boil or steam, avoid overcooking your vegetables. Overcooking breaks down cell walls, leading to further nutrient loss and a less appealing texture. Aim for tender-crisp vegetables.