Those same Italian researchers found that steaming is the best method for preserving antioxidants found in broccoli and zucchini. But contrary to what you may think, this may not be the healthiest way to prep vegetables anyway. Many of the vitamins and nutrients in vegetables are fat soluble, meaning your body absorbs them better in the presence of fat. If you prefer steaming your vegetables, toss them with a small amount of olive oil before serving to boost nutrient absorption.
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Growing Guide: Zucchini