It is not. I am not saying people should not eat healthy or should not try to lose weight. I am just saying that pushing the oversimplification that for everyone it is just calories in vs calories out and that it is only about willpower is not correct. People should get the right help with losing weight and the factors that cause the weight gain or makes people not losing the weight should be addressed.
There is lots of scientific work on this. I copied some links from another comment I made.
For example, this is an article in Journal of Obesity. It discusses the role of willpower and provides an overview of some of the research on other factors that affect whether people lose weight, such as metabolic compensation.
This is another interesting paper in the Irish Journal of Medical Science on patient's view on obesity as a disease. I think the conclusion of this study aligns well with some of my claims:
The presence of beliefs and perceptions to support the narrative that obesity is a choice, that choosing to eat less and move more effectively treats the disease and willpower is a principle determinant of weight loss maintenance may negatively impact long-term treatment. A belief that obesity is a choice will see prevention and treatment strategies continually focus on education regarding eating less and moving more, which may be suboptimal. Therefore, the narrative must change and align with the science regarding the biology of obesity as a disease.
[This] (https://www.sciencedirect.com/science/article/abs/pii/S0953620521000029) paper on weight regain also claims that it is not just about compliance with a diet, but that, amongst others, metabolic adaptation and changed appetite play an important role as well.
If you disagree, please provide some substantiation. I would be interested in reading it.
It is very secure