This is one of those things that, when you discover it and try it out, you wonder why it took so long to become a thing. The idea of blending butter into your coffee, rather than using creamers and sweeteners was recently popularized by Life Hacker Dave Asprey. *Although this style is often called "Bulletproof Coffee" because that is the name of Asprey's brand - he sells a single-origin, low mycotoxin coffee - making this at your home does not require any particular coffee to be delicious. Still, if Mr. Asprey is correct you may be better off purchasing a single-origin coffee (beans that all come from one place, rather than the typical blend of all sorts of supposedly mold-infected beans from different locations).
The idea came to The Bulletprood Exec. when he had tea with butter in it - as is typical in cold, remote climates like Tibet and Siberia. Buttered tea is a mainstay in some regions because it provides the calories and nutrients needed to stay warm, alert, satiated, and happy when the frost is always nipping at you. But why not do the same with coffee? Why not indeed.
To get super fancy, Dave Asprey recommends not only blending in butter, but also coconut oil, or better-yet MCT oil (medium-chain-triglycerides). Not surprisingly, he sells a high quality, coconut-oil derived MCT oil. I'm getting old enough to now have seen nutritional fads come and go, and come back again. Coconut oil is one of those things that, depending on when you are in history is either glorified as a super-food or portrayed as a villainous holder of ill-will toward your health. The same could be said for butter. Or eggs. Or wheat. Or milk. Or any food. The reason that coconut oil sometimes gets such a bad rap is because it is high in saturated fats. You know, the evil fats that raise your cholesterol and clog up your arteries and give you a heart attack. Except, none of that is true, other than it really is high in saturated fats and other GOOD-FOR-YOU fats, like MCT's. Some people have been catching on, but if you haven't heard, the truth is that saturated fats - the kind of fats found in animal meats and milk and in coconuts and in palm oil - these are highly nutritious substances. I'm not going to get into the history and politics and mistakes that promulgated the crazy notion that good fats are bad for you and bad fats (polyunsaturated) are good for you. Just know that egg yolks are healthy. Cholesterol (both kinds) is not what they told you. And saturated fats are awesome. With a caveat...
When sourcing your meats and milk and butter, you will be doing yourself a favor to buy grass-fed, or pasteur-raised products. There is a difference in the nutritional profile when an animal is allowed to eat grass its whole life, like its biology evolved to do, vs feeding grains to factory-farmed poor beasts. It may be difficult to find or prohibitevly expensive for you to regularly consume grass-fed meat, and your body may or may not respond well to pasteur-raised milk, whether or not it is raw or pasteurized, but it is getting easier and easier to buy very good butter for all of your butter needs, especially for in your butter coffee. Many places, including Trader Joe's, carry a brand called Kerry Gold butter. This is the stuff! Get it. Get it now and try out some butter-coffee:
How to Make Bulletproof Coffee (Butter Coffee):
And that's the recipe for Bulletproof Coffee / Butter Coffee
What you are left with is the best tasting, and best for you, coffee preparation. The good fats will give you energy and raw materials for your body to produce hormones and transport vitamins and support antioxidants and do a million different things for your biology.
When incorporated into a diet that is not excessive in sugars, eating good fats can actually help your body to prefer seeking out fat - even body fat - as a preferred fuel source. This results in burning body-fat throughout the day. Healthy fats, including saturated fats, will also reduce hunger because the body knows it is getting a rich supply of what it really needs. And when in your coffee the fats will extend the buzz you get from caffeine and reduce jitters and the classic crash associated with caffeine come-down. And butter-coffee is safe to drink if you are intermittent fasting (which usually mean not eating any food between dinner and noon the next day or later), and will probably amplify the results you are looking for (cellular repair, fat-loss, and enhanced energy).
When butter-coffee is combined with nootropics (smart-drugs/supplements), you get the best of both worlds - physical and mental energy. Because I like the taste of coffee, the ritual of making it in the morning, and the control of quality I get when making my own brew plus butter, I usually don't buy the overly-priced coffee in cafes. And because I enjoy coffee, I don't like to take supplements or drink that have isolated caffeine added. No energy drinks and no nootropics or other supplements with added caffeine.