Does activated charcoal absorb calories in food if I take it after a meal?

It will not absorb enough calories to cause weight loss.

That depends on how many calories were in the meal you ate and how much activity you engage in (how many calories you use) and how fast you do it. Your question is like asking someone, if I some money, how long will it take me to spend it? You have to provide some NUMBERS if you want a number.

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RE:
Does activated charcoal absorb calories in food if I take it after a meal?
Does activated charcoal absorb calories in food if I take it after a meal? I have heard that it can maintain blood glucose level in diabetes patient as it can absorb glucose. Are there any significant risks when using this method to get rid of the calories?