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I am sorry to hear this, typically 2/3rds of those who take Olanzapine will gain weight, whereas you are saying that since stopping you are gaining weight?
This makes me question the actual cause. One consideration is that Olanzapine impacted your thyroid function, therefore since stopping if you remain hypothyroid, you would gain weight.
I would suggest that you need fasting bloods, firstly to ensure your sugars are fine and do not have diabetes or pre diabetes, secondly to check what your thyroid function is doing.
As I said, this is not a reported side effect, certainly not a risk associated with the medication. If your thyroid function is fine, you do not have diabetes, if it is secondary to the medication then this will settle with time, if not, then you will have to address this as per any weight gain. I would suggest seeing a dietician, but also keep regular food diaries. It is easy to increase portion sizes, change exercise only a small amount and then weight can easily be gained. You can only gain weight if you are taking onboard more calories than you are using, certainly food groups like soft drinks can cause weight gain - even diet soft drinks. It is a common thing that we see, but you don't often see it yourself until you keep this diaries. I would suggest seeking the support of a dietician to start addressing your weight gain.
That is interesting. Soft drinks that a zero calorie, despite saying that will cause weight gain. They use a type of sugar/sweetner that can be broken down. I have to say if I drink diet coke etc when exercising or dieting - it is so much harder.
8-10 cans per day is a very large amount. This can also add to increasing insulin resistance and diabetes, so I would strongly advise dropping these as soon as possible, which I suspect would result in you returning to a more normal weight.
Diet drinks also encourage hunger unfortunately. Which doesn't help either.
I think the diet drinks seem like the obvious cause to your problems. Try without them and see how you get on, allow a few weeks to start noticing a difference though. Hopefully this will all you will need to do.
That is my pleasure, all the best with this.