Nutrients are present in all the fruits but in different quantities. Hence, it is essential to be aware of the nutritional value of fruits before we add them to our health routine. Pink Grapefruit vs Pineapple Nutrition will help you choose the best fruit among the two. Carbs in Pink Grapefruit and Pineapple are 10.70 g and 13.12 g respectively. The protein content of Pink Grapefruit and Pineapple is 0.80 g and 0.54 g. Protein to carb ratio of any fruit must be approximately 1.34. Protein to carb ratio of Pink Grapefruit is 0.07 and in Pineapple, it is 0.04. Nutritional value of fruits is incomparable to other food items. They provide all the vital nutrients required for proper functioning of our body.