If you're a beginner in keto diet, you may stumble across buttermilk at one point. You may ask: "Is buttermilk low carb?"
Buttermilk is made by adding lactic acid bacteria to low-fat or skim milk. It adds a creamy tanginess to a variety of low carb dishes.
One cup of low fat buttermilk contains 11.5 g carbs, 103 calories, 8.3 g protein, and 2.6 g fat. It's a good source of calcium, riboflavin, Vit B12, and panthothenic acid.
So to answer your question "Is buttermilk good for keto diet?" The answer is: No. It has high carbs and takes a substantial portion of your daily carb intake.
But I believe that most food can be included in a keto diet as long as you pay attention to your daily carb intake. You can consume ½ cup of buttermilk without affecting your ketosis levels.
Using buttermilk as a marinade might be the best way to keep the carb count under control, as most of the marinade is typically discarded in many recipes.
But if you're into a strict keto diet, try dairy-free buttermilk, greek yogurt, sour cream, and heavy cream as buttermilk keto substitute.