It usually takes three to four days for your body to go into ketosis because you have to use up your body's stores of glucose, i.e., sugar first, Keatley says. Any major diet change can give you some, uh, issues, and Keatley says he often sees patients who complain of IBS-like symptoms and feeling wiped out at the beginning of the diet. (The tiredness happens because you have less access to carbs, which give you quick energy, he explains.)

Hi Valerie, I was the same way with coffee until I figured a way to wean mysel off of it by slowly adding decaf to my regular coffee. each day I would add more decaf and less regular coffee until eventually I would have a cup of decaf. it tastes the same but the caffeine effect is different Im not sure with soda though, but at least now you can try the half and half with regular soda and diet sodas in a cup. It may taste too sweet at first but you have to allow yourself to get used to it and gradually decrease the regular soda in the cup and add more diet soda. You can also lower your intake of it as well. These days they also have caffeine free soda as well so you have some weaning options instead of cold turkey. Your soda mixture will have just enough caffeine in it to prevent a migraine, but allow you to consume less caffeine eventually until you might try adding some water to your soda to wean yourself completely off of it. It’s worth a try.
Sleep enough – for most people at least seven hours per night on average – and keep stress under control. Sleep deprivation and stress hormones raise blood sugar levels, slowing ketosis and weight loss a bit. Plus they might make it harder to stick to a keto diet, and resist temptations. So while handling sleep and stress will not get you into ketosis on it’s own, it’s still worth thinking about.
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