ca.vermeulen, post #3: Picking up post #2: that is the part I would want checked first. Rate of change: reporting progress as "lost 5 kg in 12 weeks" is more useful than "currently at 82 kg" because the rate tells you whether the change is steady, accelerating, or stalling.
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Coming back to post #3, because the follow-up matters more than the original answer.
Non-scale victories: muscle gain or maintenance, clothing fit, energy level, and capability (like climbing stairs without breathlessness) are measurements that scale-based weight misses.