My sister is very fat. She never gave up losing weight, but it didn't work. . .
Yes, losing weight has always been a very hard thing, which is not only time-consuming and laborious, but also not necessarily effective and nerve-racking.
I have a brother who used to be fat. He found a suitable way to lose weight on "592 Weight Loss Network" and then he lost weight!
The landlord can also go and have a look. I wish your sister an early slimming success!