People are able to eat real food. There’s plenty of it out there.The first and most important thing to do is fix what is being done to the food. People need to be able to eat real food, not ultra processed rubbish. Exercise and good rest are very important too, but until the food issue had been fixed, nothing else will be enough. You can't outrun a bad diet and the biggest issue with obesity is ultra processed sugar packed food.
People need to fix shopping and eating habits. Stop buying junk food and highly processed foods. Eat an apple once in a while. The kind with skin, not baked in a pie crust.