Our expert says:
It's possible that the change is muscle related, but I must confess that the length of time over which this has happened is unusual. That is, you don't normally find this kind of consistent increase. Water retention also can't explain it - you cannot possibly store 12kg of water, which is the implication if this was water retention. So it's not that, to dismiss at least one possibility.
I'm not sure how old you are - it is expected that with age, weight rises, because muscle mass gradually declines and so we tend to increase non-lean mass unless our diet changes. Therefore, the only thing in my opinion that could change the weight this consistently year on year is a problem with diet. I cannot see any other factor, unless your exercise routine has been very up and down and inconsistent. So I think it's diet, simply because of the length of time over which this has happened. THings like muscle mass, blood volume, etc are all short term and change quickly, they don't last years.
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