Here's my achievements to the end of August. I've just got to 7 stone weight loss, just shy of 100lb in about 8 months.
How? Mostly changes to my diet.
I eat only whole foods, cooked from scratch. I have 7-10 vegetable portions a day plus 1-2 pulses portions a day and 1-2 fruit portions a day. With plenty of lean protein and a few carbs, that's all very filling.
I generally follow a low fat diet. I have not eliminated carbs but I don't eat bread or pasta (on the basis they are processed and I don't buy anything processed), only occasional rice and couscous. Then I have warm oats (with water) every day.
I am mindful of the calories in stuff. I don't calorie count all the time but have 2 or 3 weeks every few months where I weigh and record everything. This is to keep my calorie estimations accurate at other times.
I try to make every calorie "worth it". So it's either carb fuel for my running, or protein for muscle recovery, or I recognise when I'm hungry and try to eat something as filling as possible for as few calories as possible.
I also recognise when I want to eat something just because it's delicious. I don't half-ass do it then. I can't bear the idea of "diet junk food" (of the sort SW market). If I want a delightful pudding or ice cream, I don't have the diet portion. I have the calorie-laden one and savour and enjoy every last bit of it. But, I have a proper understanding of what "treat" means. It does not mean every day. Or even every week.
I also run. Quite a lot. I don't run for weight loss though. I run because exercise is healthy and gives me a healthy heart to go with my healthy body.
And also important, I think, is that my whole family all eat the same as me. DH and children aged 13, 12, 9 and 3 and we eat delicious, healthy and nutritious meals all together around the table. So I am not going it alone with the intention to go back to "normal" after finishing a diet. There will be no finishing the diet because this is how we eat now and we all enjoy it.