There are 0.001 gram in 1000 microgram.
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1 gram of carb = 4 calories.
1 gram fat produce 9 calories i.e. 37.7 kJ
fat = 9 cal/gram; carbs and protein = 4 cal/gram; alcohol = 7 cal/gram therefor 4 grams of carbs has 4x4 calories = 16 calories
fats supply the most calories per gram
1 gram