Portion size is key.
I lost 4 stone - started a year ago. My BMI was 29 and it's now 21. I feel so much better, have more energy, my blood pressure is lower, all good. My fybromyalgia symptoms improved no end, and I have less joint pain than before.
When I started to lose weight, I cut out the sweet stuff (sugar is evil) and the first couple of weeks were awful. I was constantly hungry, then like the above poster, I got used to it. I counted calories, but ate a lot of vegetables, pulses. Only wholegrain starches (carbs).
Portion size is crucial because you can eat a lot of healthy food and gain weight. I eat about a half of what I used to eat, and feel full. You do adjust to having smaller portions.
Work colleagues, one in particular thought she ate a healthy diet (she did) but she ate huge amounts - a huge of pasta for lunch, 4 rounds of bread with her homemade healthy soup - and was very overweight.
I know that there are sometimes medical reasons that hinders weight loss, but a lot of people, regardless of this, eat too much. But some people want to blame it on their income/their genetics/their busy life style, whatever. Some will be denial about the health risks of being too heavy, but they are real.
Clothes sizes have got bigger along with the portions that have grown over the last few years.
So a size 12 now, would have been a size 16, 30 years ago. We are encouraged to eat too much.
Just because a lot of people are overweight (and I was one of them, and in denial) doesn't mean we should compare ourselves to them, or criticise them. But ultimately we are the only people who can sort it out. Don't minimize the health risks because they are real, but if you feel you are happier overweight, combined with the risks, then that's absolutely fine. But if you're not, do something about it. No one else can do it for you.