Does ingesting lactic acid cause insulin response?
NuLu, There is some evidence from rat studies
that lactic acid raises the insulin response. But this only occurs at very acidic pH, and not if the lactic acid is buffered, as I would expect it is in kefir. Furthermore, the lactic acid content
of kefir is about 1% by weight. While this is a higher level than in most foods, it is still a very low level in terms of its contribution to calories. So I wouldn't worry about it.
I think Kefir is a very healthful beverage, mainly due to its beneficial bacteria, which it appears can colonize the gut even more effectively than those in yogurt. It is not very insulinogenic, at least if you have a typically serving size of one cup. According to one source
, a cup of unsweetend kefir contains 12 grams of carbs (8 of them as sugars), 11 grams of proteins, and 2 grams of fat. If you use my guidelines for platinum calories, then your dose should be limited to no more than 10-20 total grams of insulinogenic carbs per dose. Counting protein at 50% the level of carbs, means that kefir has 12 + 11/2 = 17.5 grams of insulinogenic carbs per cup. Since oil is non-insulinogenic, you should be OK if you keep the amount of kefir to one cup, or preferably less than that.
However if you have flavored kefir, which is typically sweetened, you will induce more of an insulin response.
Since your interest is in finding a way to blend oil into a single phase with an easily digestible drink, have you tried mixing your oil into heavy whipping cream? It works great and is totally non-insulinogenic. If you find it to be too "thick" or rich, you can even dilute the cream somewhat with still or sparkling water after you have first blended in the oil. It is even more refreshing and hard-to-taste if you pour the mixture over ice cubes. If you do this with cream, the concotion foams up like "cream soda" which has a very nice mouthfeel.