Syed, as Paul pointed out,they are all important for different reasons:
GL, will guide you in terms of glucose impact from specific foods
Calories can be important for those on an LCHF maintenance part of their diet, if they are consuming more both an they are expending, even if they are sliding my the principles of low carb, moderate protein and high fat.
Carbs- most diabetics are intolerant to some degree
Fat - most of us are not eating enough fat, especially if we end up cutting the carbs. Need to be aware of the good fats and the toxic fat such as trans and hydrogenated from crackers, veg oil, margarine
Fructose - the suffer in fruit. Only the liver can deal with this and again most diabetics have to be careful about types and frequency and quantity. Lowest impact are generally berries.
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