Anything with calories breaks a fast and artificial sweeteners (0cal) spike insulin in most people which breaks your fast. Loose skin can happen to anyone, IF doesn’t effect that. I’ve read 25-50lb weight loss can cause loose skin. It sucks but only preventable by not losing the weight 😔
Replace soda with sparkling water. La Croix Lemoncello is my go to for sweet cravings. Tastes like it is sweet but there is no sugar or sweetener. Bubly blood orange grapefruit has been another amazing discovery