The term “well-formulated ketogenic diet (WFKD)” was first coined by researchers Dr. Steve Phinney and Dr. Jeff Volek, the founders of Virta Health. The goal of a well-formulated ketogenic diet is not only achieving a state of nutritional ketosis but doing so in a way that supports optimal health and can be safely followed indefinitely.
Follow the link below for further information:
Coffee 
Dr. Peter Attia describes the mental and physical benefits of a low-carb (ketosis) diet through his personal experience and experimentation
LCHF - is it my imagination or .....
Is cream a good LCHF food? (as part of a balanced diet)