Once again, it appears that IF is a candidate for a more accurate definition. After reading the excellent article by Phinney and Volek, I'm guessing that many who are doing what is being called IF on a daily basis is more a process of feeding timing. Some of us are eating 2 meals per day and go 18 hours between meals on successive days. Is this really fasting or is it better described as periods of recovery between meals?
Refeeding: From personal experience, I can see where IF over multiple days can have negative consequences in how one approaches the IF and how one starts eating when it's over. We've all wondered and speculated about Jimmy Moore's experiences with fasting. The observations about refeeding and the slower replacement of LBM along with added fat is revealing about how little we know about this dynamic. For those doing IF while on a standard diet, it appears to be very risky. For those eating LCHF, it's also risky and the consequences of adding fat mass when refeeding must be known. It's not necessarily a sound weight-loss protocol.
I continue to be curious about the benefits of IF in the sense of establishing a duration just long enough to experience autophagy for metabolic cleansing and health, create BDNF for improved mental awareness and brain health, and to enhance aging gracefully with an increased life span. Could it be that IF is a vehicle to achieve health benefits other than weight loss? If so, how long and how often would be my first two questions. There are many who identify IF as a health option and don't promote weight loss as a prime benefit. Like Mark Mattson (yes, I've provided this link before, but it's informative):
https://www.youtube.com/watch?v=4UkZAwKoCP8
Lots more to learn here. For IF as a sound vehicle for general weight loss, I don't believe this is the best approach
for me. No longer will I consider two meals per day with 18 hours between meals on successive days a form of IF, it's really how I time my meals, maintain satiety in between, and encourage ketone production.