Our expert says:
That's not too unusual. 1kg is not that major a gain anyway, and even the time of day that you measured the weight can affect it - a meal and a drink compared to none can swing it by 600 grams easily. The scale is also important - if it's not calibrated, then you're out by a long way, so you have to be careful about how you measure it. That's why I would only suggest a weighing once a month (though you can obviously monitor it much more, but just don't read too much into it) and always the same way.
Next, gaining weight is pretty normal - your plasma volume can rise (literally, your body makes more blood) and your muscle mass can go up. I suspect it's too early for the muscle, but certainly the plasma volume rise by even 500ml can explain the change. So I wouldn't worry about it just yet. if by the end of December, you're still up there, then it's time to look at it more closely.
Bear in mind that you may well eat more now that you're training - subconsiously or not, your body needs more energy and if you don't manage how you provide it, you'll struggle to lose weight as well. So diet is very important, especially now that December is approaching and there will be a tendency to eat more. My advice is to spend the next four weeks getting fitter, and not worry too much about the scale, because of the Christmas factor.
So just give it time and it will come, as long as you stick to sound principles.
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