I lost a lot of weight through dry fasting with carnivore refeeds. Didn’t get the loose skin.
Back in the days when I was inexperienced and still believing I could make it through CICO I looked horrible. Then I tried low-carb/water fast and my body was a tiny bit better but definitely not looking toned.
I think that dry fasting + carnivore refeeds is the one way that actually got me to lose all that weight without suffering the typical loose skin everywhere.
I did dry fast for long periods of time 4 to 8 days and kept my refeeds short. ( 1 or 2 days ) I don’t really believe you get enough from 1 - 2 days of fasting.
I think fasting is supposed to get you more toned anyway than regular weight loss diets, since (if I understood it correctly) some excess protein and stuff is used in the process, the autophagy, cells renewed faster. However, I think intermittant fasting is the best for this so you sort of get a steady weight loss + autophagy flow rather than a lot at the same time. And I also think some food/imbalances in nutrients/remaining health issues or hormonal imbalances can complicate stuff.
I have also been wondering something similar considering I have a rope/string cut in the length of my stomach when starting “dieting” (water fasting and keto), measured now -15kg later and just after finishing a fast (so not much in the stomach yet), it still shifts between +/- 0 to -4 cm around the stomach, pretty much nothing. What happens is that the belly and thigh fat feels softer when I have done a fast or lost weight, it does not go away. Really annoying :P
But I still got hopes for it getting better eventually if I lose even more weight, very much possible it is hormonal though.