Partial... I lost 20 kilos over 3 years, though with some plateaus and bounces up over that time (on another bounce at the moment, curses!) 20kg is over 3 stone. I'm 50 now. I want to lose another stone and get to a healthy BMI.
2 things work for me: myfitnesspal and exercise. I can only eat about 10% of what myfitness pal allows me for exercise though.
I find MFP hard to use as sometimes if I make something at home I have no idea how much of each ingredient is in my portion. Unless you weigh out every single ingredient of everything you make I don't understand how it's possible.
If you're using a recipe online you can paste in the url and the app will calculate the calories? I sometimes just find an equivalent recipe even if I'm not following it exactly. I use the barcode scanner for ingredients too. You soon get the hang of typical amounts.
I've lost 12kg since the end of July to get myself back to a healthy BMI. I have thyroid problems, so for me it was a combination of getting the hormone treatment and I've been doing Intermittent fasting which means I reduced the amount of time to eat and trying to eat 80/20 healthily.