Yellow peaches have a fair amount of nutritional value. A 150-gram medium-size peach contains the following nutritional values: Calories: 50. Fat: 0.5 grams. Sugar: 13 grams. Fiber: 2 grams. Protein: 1 gram. A yellow peach also provides the following daily recommending percentages of vitamins and minerals: Vitamin C: 15%. Vitamin A: 6%. Potassium: 4%. Iron: 1%.