I *love* my Bulletproof coffee, Deb. I have black coffee and 2 tbsp. of Coconut Oil...*LOVE it*...I used to put butter AND crème...and found that I am Lactose intolerant (sigh)...sooo it is JUST plain blk coffee and my CO. :)

How necessary is this?

Not at all.

Ketosis isn't about eating a specific thing or drinking a specific thing, it's about eating x number of carbs, y number of protein, and the rest of the calories in fats. In no way do you need to drink dairy products and feel sick in order to successfully get into ketosis.

Throw off the shackles of thinking of diets as requiring certain foods. Keto, in its best form, requires you to figure out what you like and can tolerate while maintaining a specific set of macronutrients.

I ate a cookie the other day. My language exchange group met at my house and one member brought cookies, so I checked the nutrition info (the first Japanese writing I ever learned were the characters for fat, protein, and carbohydrates) and saw that I could make a cookie fit into my carb limit, so I ate one. Frankly, it was delicious. That girl left the cookies here, and they've sat since because I don't really want them (I'll bring them into work to give away). On the other hand I didn't eat any of the cake or potato chips another person brought. The potato chips went immediately down the garbage disposal when she left, and the cake went to the office the next day because I was deeply tempted (Japan knows how to do pâtisseries just as well as France).

So no, you don't need bulletproof coffee, or anything else specific. I drink it because it's handy in the morning.