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. White Grapefruit vs Lemon Nutrition will help you choose the best fruit among the two. Carbs in White Grapefruit and Lemon are 8.41 g and 9.30 g respectively. The protein content of White Grapefruit and Lemon is 0.69 g and 1.10 g. Protein to carb ratio of any fruit must be approximately 1.34. Protein to carb ratio of White Grapefruit is 0.08 and in Lemon, it is 0.12. Nutritional value of fruits is incomparable to other food items. They provide all the vital nutrients required for proper functioning of our body.