Vegetables and fruits that are either yellow or orange in colour, for example, yellow peppers, melons, pumpkins, etc., have a substance present in them called beta-carotene. This substance is a strong antioxidant that helps to fight breast cancer causing agents in the body. Adding one yellow-coloured fruit or vegetable in your diet daily, will help to reduce the risks of breast cancer. Apart from the yellow ones, even green veggies like cabbage and broccoli are extremely fierce against cancer cells in the body.