You mention heavy cream--if you get raw organic heavy cream that's a very good source of fats, which the low carb diet is supposed to rely on.
So, don't give up the heavy cream in the coffee, but give up some form of carbs instead.
One of the problems with carbs and sugars is they feed the insulin cycle, and you're trying to substitute fats instead, which is the opposite of the food pyramid that has ruined so many people these past 50 years.
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