Bicepsual:
When you're talking about a massive 30oz protein shake, 4 tablespoons is nothing – you can't even recognize it. 4 tablespoons of olive oil is 500 calories. You could double it and wouldn't even taste it.
People use more than that on a salad. It doesn't instantly cause indigestion, particularly if you're consuming it daily. I've seen bodybuilders straight swigging olive oil lol.
Certainly an interesting idea to say the least!
I wonder how it may affect the taste of a blended cake shake (half a box of cake mix + 1 pint of dairy liquid* = about 18-20 fl. oz volume.. the recipe could potentially be doubled I guess, just got to watch the amount of dairy fat in one go).
* - Dairy liquid can be whole milk, half & half, maybe even part heavy cream.