I'm not sure if reducing variation is practically possible.
Speaking for myself only, there can be fluctuations of ± 0.8kg with no change in exercise and little in diet.
Sticking to ultra-regular meals and drinks would mean I'd never go out/away.
I'm half a kilo down on last week, despite three nights away and some Big Hotel Meals as well as dreadful constipation.
I'm only looking for +/- 2kg rather than the +/- 5kg I've typically seen. Not fussed about daily fluctuations - indeed, I like that Garmin's default snapshot in connect mobile is the weekly average.
Btw, I read two things that made me think of things you've said this week. First was that Sloths can lose a third of their body weight when they poo. Second was that in a trial to find the limits of the benefits of fruit and veg consumption, people in the huge number of portions per week had the biggest "deposits"
Target for this year is reduced variation. Am bored of the pattern of gaining weight as I ride more, especially when I start doing longer audax. Aiming to go hyper and do LEL this year, so this will be a decent challenge for me.
7% body fat is rather low. (and doesn't really correspond with the BMI of 20?). Are you use you need to lose weight?
No, I want to maintain weight. I don't need to lose more. Indeed, when I was down below 18.5, I felt awful everywhere but hills (albeit my training stress balance was >100, and I was reacting badly to meds).
In terms of whether 7% is correct, whilst I wouldn't want to defend BIA measures of body composition, I've had DEXA, and got the same number when I was a kilo lighter, but hadn't been training as hard or had a strategy for maintaing a sensible protein intake.