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. Longan vs Guava Nutrition will help you choose the best fruit among the two. Carbs in Longan and Guava are 15.00 g and 14.30 g respectively. The protein content of Longan and Guava is 1.30 g and 2.50 g. Protein to carb ratio of any fruit must be approximately 1.34. Protein to carb ratio of Longan is 0.09 and in Guava, it is 0.18. Nutritional value of fruits is incomparable to other food items. They provide all the vital nutrients required for proper functioning of our body.