The nutrition info tells you how much fat, carbohydrates, proteins etc are present in the food item. You cannot go by the packet size alone for the nutrition info because they typical print a "serving size" and approximate number of servings in each packet. 4.9gm carbohydrates in 500 ml milk does not sound right because 240ml milk has about 8gm sugar. My guess is Nandini milk 500ml packet has about 3 servings each containing 4.9gm sugar.
The nutrition info is not always printed correctly or properly. As a diabetic what you should look for is the total carbohydrate content and the fiber content. Whether sugar content is listed or not is not so important. So if a food item says there are 55gm carbs total with 5gm fiber in a 100gm serving, then when you eat the 100gm serving your body will digest it and convert (55gm - 5gm fiber) 50gm equivalent into glucose. As a diabetic you do not want too much carbs so I won't make a generalized statement that 1 cup of milk is good or bad for every diabetic. But this will give you a basic idea of carb counting. Proteins when digested will also get converted into glucose but it is a very slow process hence they don't spike up your blood sugar levels. Fats do get converted into glucose as well because glucose is the primary fuel that is used to run the body. (Not to confuse you but I want to mention that when a person has placed their body in ketosis, the body starts using ketones as fuel and glucose is not the primary fuel in that case). In case of proteins and fats the body uses a portion of each of them for other purposes such as proteins for building muscles, fats for building cell membranes and parts of the brain etc. So not all of the proteins or fats that are eaten convert into glucose either.
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LOW CARB RICE!
Diabatic for about 37 years peripheral nuropathy pain in foots & taking insulin
Controlling Blood Sugar Levels
I cured my diabetes in one month 
LCHF
