Watermelon seeds along with dried fruit in home-made trail mix. If you opt for pre-roasted watermelon seeds, make sure to check the nutrition label before you buy -- seeds roasted in oil and seasoned with salt might come loaded with unwanted fat and sodium. Eat your roasted watermelon seeds in the same meal as fruits and vegetables, since vitamin C -- a nutrient found in many fruits and veggies -- helps your body better absorb the iron in the seeds.and