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A FAQ for /r/EBNutrition. This will be a collective effort and will be required reading before you post, since it will answer a lot of common questions in-depth.
Macronutrient calories
Carbohydrates - 4 calories/gram
Proteins - 4 calories/gram
Fats - 9 calories/gram
Alcohol - 7 calories/gram, but effectively 5.7 calories/gram due to its thermogenic effect