Each medium-sized tangelo contains 4 percent of the recommended daily allowances of potassium, calcium and magnesium. Adequate intake of these minerals is vital for maintaining the health and strength of the bones and teeth and for regulating blood pressure. Potassium may help prevent strokes, and high calcium intake may contribute to lower cholesterol levels. Consuming magnesium-rich foods like tangelos may decrease the risk of diabetes and depression. Tangelos contain only a trace amount of the mineral iron, but eating the fruit with high-iron vegetables like spinach or other dark green, leafy vegetables can increase your overall iron intake. The iron in vegetables cannot be absorbed easily by the body unless it is accompanied by a food rich in vitamin C, such as tangelos. Try mixing tangelo sections into a spinach salad for a mineral-rich meal.