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Andrew Meyer Are you sure? That seems contrary to what I hear online from the likes of Thomas DeLauer & Dr Eckberg. Dunno, maybe it’s just a matter of degree. Regardless, the smart bet is undoubtedly to avoid diet drinks regardless because they just aren’t good for you. I’ve switched to water and honestly don’t miss the sodas any more.
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Biff Tannen A clarification on this. I would hesitate to say it "kicks you out of ketosis". Partly because that is a highly subjective statement and can mean different things to different people.
From what I have seen there seem to be some recent studies on the effects of artificial sweeteners that have related ingesting artificial sweeteners with a rise in insulin production. Granted, the results have been mixed and the results seem to vary between different sweeteners, some seeming to have no effect at all.
Yo date none have caused any increase in blood sugar levels, however some sweeteners do seem do cause a temporary increase in insulin levels. So my takeaway would be that drinking diet pop may cause a temporary slowing down of ketone production due to an increase in insulin which has a dampening effect on ketone production.
I don't believe the effect lasts for long and so I wouldn't worry greatly about it provided you aren't guzzling litres of diet pop every day. If it makes you happy, and makes staying on a keto diet more manageable than by all means drink your diet pop.
I would just go on the assumption that after drinking a diet pop my ketone production will drop off for part of the day (maybe an hour or two maybe less). If I am well into ketosis that won't matter, if I am in light ketosis I might be out of ketosis for awhile.
I don't view "being in ketosis" as just an all or nothing. I view it as a matter of degrees, which changes constantly throughout the day as I eat, fast and exercise.