Many of us drink bulletproof beverages on low-carb. A bulletproof beverage is a hot beverage like coffee, tea, bone broth, or very-low-carb hot cocoa or carob, to which a good fat has been added.
The original fat for a bulletproof beverage was butter. MCT oil is also popular— I used to use that when I could afford it. Heavy whipping cream (NOT creamer) is used both as a fat source and a ‘lightener’.
Coconut oil, bacon fat, beef tallow and extra-virgin olive oil are all fats I have used in bulletproof beverages. Recipes for bulletproof coffee tend to call for 2 Tablespoons of fat and 1 Tablespoon of heavy whipping cream. I tend to use a bit less fat than that, and omit the cream when I’m out of cream.
Why do we want fat in our bulletproof coffee? Both fats and proteins are essential for humans. It’s the carbohydrates which are non-essential. That old ‘fat will kill you’ mantra is NOT science based.
One thing fat does for us is make us feel fed and unhungry. High-carb, low-fat foods, on the other hand, are easy to eat and eat and eat.
Sweeteners are usually not added to bulletproof beverages, except that I do add a few drops of Sweetleaf liquid stevia to the cocoa, cacao or carob in hot cocoa/carob.
Dr. Jason Fung in his book on fasting sometimes makes it sound like you can have full bulletproof beverages while fasting, and in other parts of the book it seems like you are only allowed one very lightly bulletproof beverage with only a teaspoon of fat.
I translate that into 2 kinds of fasting— strict fasting with only one lightly bulletproof beverage, and bulletproof fasting with full bulletproof beverages allowed.
I do one kind of fasting or the other most mornings, and only open up my ‘eating window’ at lunchtime. On days I have bulletproof morning fasting, I am at least giving my body a break from carbs.
I stay in ketosis most of the time, even when I have a carb indulgence. I really think my bulletproof beverage custom helps with that. They are so low carb you can even have them on Induction! (They are NOT low calorie— but we count carbs not calories.)
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Reading: Good Calories, Bad Calories by Gary Taubes will help you understand why our society is so fat-phobic yet unworried about high carb even for dieters and diabetics.