Our expert says:
Hi there Michelle
Difficult one. It would take some real detective work to figure out the source of the problem. The first thing is that you're not actually overweight -your BMI is 22.9, and so it might be that you don't have too much weight to lose. What I do think is certain is that it's not likely that your problem is down to Sprite Zero or flavoured water. Of course, if you drink these things excessively then it does become a problem, but in moderation, I don' think it is, and you're likely to be overcomplicating things by looking into that in so much detail.
I think you need to step back, and assess your goal, and what you're doing to get there, because it seems you've become bogged down in the minute details, and I don't think they hold the answer. So I'd see a dietician about the diet, and a trainer about exercise, and make sure that you're doing things the right way.
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