In August I am going strict keto with no weekend cheats until at least Thanksgiving.
I have a weakness for Coke Zero and some Zero Jello may be nice while giving up everything else.
Is there any evidence or speculation that these substance would interfere with fat adaption?
It looks like Coke zero uses aspartame. From a small amount of research, it looks like this does not affect insulin or glucose. It’s probably okay, as long as it doesn’t cause cravings.
Aspartame does not spike insulin, but it does form some formaldehyde in the body. Further, there are some studies indicating that consumption of artificial sweeteners can increase appetite about as much as sugar - so if you notice feeling hungry, this may be the culprit. I use stevia, monk fruit, xylitol, allulose, etc, but I don’t seem to notice much in the way of hunger spikes.
Never once had an issue, and if you’re not eating carbs, you’re not going to (not) burn fat because you consume aspartame.
I seriously depended on sweet desserts when I started keto (in order to keep my carbs low enough but I have a sweet tooth anyway and a dessert habit) and my fat adaptation arrived after 7 weeks.
I only use erythritol and xylitol, I hate the aftertaste of the super sweet sweeteners.
Very many ketoers use sweeteners. I have heard about various problems regarding sweeteners, never interference with fat adaptation.
This may sound like too much work, but I bought some beef gelatin collagen powder. It’s easy to find instructions on how to make jello with it. I add lemon juice and allulose or stevia. I haven’t perfected it yet–my product isn’t as smooth as Jello brand, but it is good enough for me and i can control the contents. I make a big bowl and then each day mix a portion of the bowl with Greek yogurt. Makes a high volume tasty treat that could pass for a meal.
I’m a regular user of erythritol, sucralose, and allulose. I’ve always had a sweet tooth, although I don’t want everything to be sweet. I’ve had coffee with just HWC, and can deal with it, I just prefer the sweet taste.
Most days I have two cups of coffee with 1 tsp sucralose and 1 tsp erythritol, then a few hours later, one cup of tea with 1 tsp of all three. Well, I have one can of diet soda (A&W Root Beer) a day.
I used to use stevia drops and monk fruit when I started ketogenic eating in 2019. When I transitioned to eating carnivore in November of 2025, I eliminated any sweeteners. I dont miss sweetness at all now.
I use sweeteners - primarily liquid sucralose and granular erythritol. It’s a daily thing for me in my coffee. I don’t really care for desserts sweetened with artificial sugars but sometimes they fill a desire.
I do freely consume breath mints and gum and of course, the accompanying sweetener used in all of those products. The only one I won’t buy is xylitol as I have a dog.
Allulose is not available in Canada (as yet) but I would like to try it.
Me too, sadly they are sweetened. I only want the mint 
Thankfully the gums loses the sweetness in the first minute and then come the mintful hours (for some reason, the cheapest gum here is insanely long lasting).
I don’t sweeten my drinks since several years (except very occasionally) but sweet desserts usually need some sweetener (sometimes I can pull it off with just sugar, more exactly lactose, all my sweetish carnivore desserts depend on dairy sugar, what else?).
Thanks all. I am trying to give up zero soda but it is nice to have especially going strict.
Diet starts Monday! Yesterday and it seems to help with the headache.
If I need “sweet”, I sometimes use stevia (I like a bit of sweet in my coffee. Doesn’t take much.) If I need “fizzy bubbles”, I use club soda, basically carbonated water. On occasion, if out to eat, I’ll ask for lemon to put in water and I do squeeze out the juice from the lemon for some flavor.
Good luck!
I use stevia drops in my coffee and it never triggered sugar cravings. But then, I never craved sweets even before keto. Give me a plate of cake or a plate of potatoes and I would pick the potatoes every time!