How long after you eat are you supposed to check your ketone levelsto see if it kickedyou out or how it effect you? I’m just wondering because Sunday I tried something new and had a bunch of carbs and I tested later on that day and it still said I was in ketosis . Monday I woke up felling awful - dizzy, bloated , headache , gassy , tired, wanting to throw up , I am out of keto strips ( the blood testing ones) and so I can’t test again to see if I’m in ketosis . I ate very little yesterday (Monday) because I wasn’t hungry so this has me thinking I never got kicked out even though the day before I had a ton of carbs . I am eating ground beef that I cooked in coconut oil with cheese avacodo and eggs with some peppers and mushrooms . I had only a bowl yesterday and I didn’t eat the rest of the day because like I said I wasn’t hungry . So how long does it take after eating high carbs for your body to react and kick you out ? I would say on my high carb day I ate most carbs in the morning to early afternoon and tested at 8pm before bed . I know I ate least had 100g of carbs maybe more- I found it hard to even eat all my food because I wasn’t hungry lol I had 2 bananas and half a bowl of oatmeal at about 8 am then at about noon to 1 had half a bowl of brown rice with chicken and broccoli . The rest of the day I only had dark chocolate which st my house I only have keto friendly kind so it was Lily’s 70% dark chocolate bar and I ate half of it other than that I didn’t eat much . Sorry this is so long 
How long after
Even if your body immediately stopped producing ketones, they don’t just disappear from your system. I don’t test (yet), but I’d imagine from research the process would go like this.
Depending on how adapted you are, your body is producing and using ketones. They’re in your system even if you eat carbs. Body notices a different fuel source. Stops producing ketones but continues to use up what is in the body. Starts using glucose for energy. Once glucose stores are used, it goes back to producing ketones. There is no set time for any of these changes to take place.
It seems to take me about 12 hours to really stop registering ketones after a glut of carbs. I bet you were kicked out sometime after you went to sleep. You may not have been out for very long though if you didn’t eat much the next day. Once you’re fat adapted getting back into ketosis doesn’t seem to be the chore it was the first time.
Here is my method for testing a new food:
t0 Before eating: Check ketones and glucose
t30 30 minutes after eating (optional): check glucose
t60 60 minutes after eating: check glucose
t90 90 minutes after eating (optional): check glucose
t120 120 minutes after eating: check glucose and ketones
t240 240 minutes after eating (if t120 was high glucose): check glucose
t720 720 minutes (12 hours) after eating: check glucose and ketones
If glucose went up form t0 to any of t30, t60, t90, or t120, I note that the food isn’t something I should eat.
If ketones dropped a ton from t0 to t120 or went below 0.4 at t120, I note that I am kicked out of ketosis.
If glucose was high at t120, I check again at t240. If it is STILL high, this is a VERY bad food for me.
If glucose is above my normal level at t720 or ketones have dropped below 0.4, I note that I am out of ketosis.
as far as that question, ther eis an interesting discussion on the reddit keto group
The liver produces ketones only when insulin is low. If insulin is high, that means that the blood is loaded with glucose, so the ketones are unnecessary. It is possible that after your carb morning, there was enough time before you tested for your insulin to come back down and ketone production to come back up again. That wouldn’t stop the carbs from making you feel miserable, however.