While buttery, creamy mashed potatoes can take the spotlight on any Thanksgiving table, the starchy side is too high on the glycemic index for many older adults. While potatoes are a fine source of vitamin C and copper, with just a little garlic and butter, mashed cauliflower can mimic the flavor and appearance of mashed potatoes. As a cruciferous venerable, cauliflower is jam-packed with cancer-preventing antioxidants, as well as protein, magnesium, vitamins C and K, fiber and potassium.