So Heard It Was Fine Putting Your Phone In The Microwave To Charge It. My Charger Broke Yesterday, My Battery Was Pretty Low So Thought I'd Give It A Go... This Happened It found vegetables that were pressure cooked lost more insoluble fibre, which is good for gut health, than those that were microwaved or steamed. A key nutrient usually destroyed when cooking vegetables is vitamin C, a severe lack of which can lead to conditions like scurvy. But boiling vegetables accounts for greater nutrient losses than microwaving them. This is because water soluble nutrients are readily leached into water when they are boiled, while very little water is used in microwaving. Short bursts of heating, such as used in microwave cooking, can retain most of a vegetable’s vitamin C.