"In reality the best way to control your weight is not to have scales - you just cut back for a couple of days and dont buy bigger sized clothes."
Couldn't disagree more - daily use of scales is what has finally, after a good couple of decades of yo-yo-ing weight, kept me on the straight and narrow.
I mean, how do you know if you need to 'cut back' for a couple of ays, unless you're monitoring your weight?
Previously, I only noticed I'd gained a bit by the time my clothes were noticeably tighter - so 'cutting back' for a couple of days was hardly going to fix the problem!!
By that time, only a concerted, sustained effort was going to get back me down to what I was.
Now, by hopping on the scales every day, I can see if I'm creeping up immediately, and then cutting back for a couple of days is actually all it takes - so much easier all round.
What works for one, won't for another, but my bathroom scales are a Godsend.
OP - I have to say I agree with you, if you change 'fat' for 'overweight'. It's very, very easy to creep into overweight territory, if not fat territory, without really noticing it.
I'm about 68 kilos and I'm 5'9" so a comfortable size 12; size 10 in generously-sized shops.
I have to really concentrate on my daily intake not to put on weight. I have to shun unnecessary snacks, think about portion sizes, and basically just say 'no' a lot of the time. I also have to get some sort of exercise on a regular basis; usually just walking. If I don't, the weight creeps on.
For me, it's either eat what I want and to hell with the consequences, or, be slim. It's taken me a long time to realise I can't do/be both. That's not to say I never treat myself; I do, just not as often or as much. I haven't changed my diet at all, I just eat a bit less.
Sounds easy - it's not, really, but I like it a lot more this way, being slim, so it's worth it. Plus, when I put on weight it goes straight to my face and I look terrible. Oh to be a shapely, buxom Nigella type, quaffing cake and buns, and yet still managing to slice carrots with your cheekbones.