Before putting butter in your coffee(yes it’s a thing), you may want to consider these points. ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
One could argue that putting butter or coconut oil in their coffee could be comparable to drinking a sugary sports drink as saturated fat and carbohydrates are both non-essential nutrients. ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
However the maximum rate of ATP resynthesis from fat is about 0.40 mol of ATP per minute, while glycogen(stored carbohydrate) breakdown can provide 1.0-2.0 mol per minute. ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
Muscle contraction and therefore all exercise is dependent on the breakdown of high amounts of ATP into free energy. ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
Then there is the thermic effect of food(TEF), this means how many calories are used processing and storing macronutrients. Fat has the lowest TEF of all the macronutrients. 20-30% of the protein calories you eat are lost in this processing, 6-8% for carbs, and only 0-3% for fat. ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
Therefore fat has the least impact on “boosting” your metabolism. ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
Unlike other dairy products which have shown either a neutral or beneficial effect on blood lipids, butter has shown to have adverse effects, this may be due to the lack of milk fat globule membrane. If you’re not overdoing the butter, you’ll most likely be fine though. ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
You’d also most likely be replacing a nutritious balanced meal of protein,carbs, fats, vitamins and minerals plus fibre with 300+ calories solely from saturated fat.