So I gave it a try in place of my usual “low-everything” calorie restricted January diet. And after months on an all-butter diet the level of LDL-cholesterol (often called “bad cholesterol”) actually declines significantly. In dieting, though, there is no such thing as a free lunch .
Some food gives you energy and some doesnt, this varies person to person. I started and quit keto 3 times before i managed to find my balance. The first few times it made be poorly, from the shock of diet change. However, you can wean yourself into the diet which i did the last time when i had the most success.