I don't understand that though. It points out that the medical profession have things roughly right - obesity is a major health hazard and the only way to deal with it is eat less.
I think it depends what you mean by less. Fewer calories & realistic portion sizes certainly. Mainly, I think learning to eat differently.
I wasn't taught about what I should & shouldn't eat or anything about nutrition at school. It was assumed we would learn that at home.
Growing up we had what I now perceive to be quite a carb heavy diet, having said that, until one got sick both parents lead very busy & physically active lives. All my siblings played some sport even though I wouldn't have described us as a terribly sporty family. That was just normal then. None of us were overweight.
I gained weight after I got sick, having been fit and slim before. I also learned that when my dose of levothyroxine needs to be increased or reduced (& that happens at least once every year, usually more) I carb crave.
When I'm in PEM, I carb crave and feel really put off by a plate of veg or salad that would normally appeal.
However, what and how I eat has changed. Ultimately, that made a big difference. When I keep the levels refined carbs and sugars down then I don't want them as often and am happier with a smaller portion when I do indulge. I slowly lost 4-5 dress sizes (dress sizes varying wildly by brand). I eat a lot of small meals. Eating this way certainly wouldn't suit everyone.
Ultimately, I don't think dieting primarily to lose weight works. Partly because the type of diet can feel punitive in the long term or is simply too drastic to be maintained. I think making changes to promote good health and feeling physically better might be more effective.
There is an awful lot conspiring against people trying to maintain a healthy weight. Food manufacturers make more more by "adding value" i.e. processing food and they have a lot of lobbying power. Once you start adding things best described by a chemical formula to food, even if those chemicals may occur naturally in some foods and aren't toxic, it can change the way the body then digests the food.
Many city flats are now designed without a kitchen beyond tea'n'toast making facilities so you either rely on microwave meals, takeaways or eat out.
My generation 's lifestyle (ME aside) is quite different to my parents' lifestyle. Generally, not so active and more processed food. When still working and on a diet as recommended by my dietician, it was extremely difficult. Already lugging laptops and CDs, phones and files about, dragging a premade lunch about with me wasn't always possible. - my laptop bag alone weighed nearly 3 stone.
Then there's the emotional or psychological burden. As a teen I have some experience on the other side of this. I had cycles of unexplained weight loss and weight gain. My GP put it down to exam stress, summer school holidays etc, even though the pattern didn't matched up to this theory. Notably he never did a thyroid function tests and years later I found this cycling of weight gain and loss is a sign of developing thyroid disease.
My mother worried about the weight loss side of it and wondered if I was developing anorexia - I wasn't, I was still eating. Unfortunately, and rather stupidly, she tended to raise this at mealtimes. I cannot tell you how irritating that was. Just to annoy her I'd avoid eating with her.
Then there's the judgement side of things because if someone criticises or mocks you because of physical appearance then it almost certainly feels like they are attacking you as a person. Perhaps ME patients are better placed to understand this given the judgmental prejudice we have faced.
I think obesity, nutrition and lifestyle is an area that could genuinely be improved using biopyschosocial methods. You have to address all areas that affect weight, oddity and fitness to be really effective. Unfortunately, that would mean actually doing some.proper work and possibly standing up to powerful lobbying groups so I guess that'll be put in the "too hard" bin and individuals will continue to bear the brunt of moral judgement.