Grapefruit : Whether you choose a plain, pink or red grapefruit, there are a number of benefits to be had. They possess a soluble fiber, which can help to lower blood pressure and cholesterol. The red and pink varieties contain potassium, calcium and beta-carotene. The grapefruit is also known as a digestive aid. So if you’re in the habit of having a grapefruit now and then with breakfast, you should stick with it.