I think the YouTube presenter makes a very good point. Obesity has a genetic factor. Genes affect one's self-control ability, metabolic rate, and appetite.
Unfortunately, every time when genetics is brought up, detractors just retort that genetics is just an "excuse" for obese and overweight to "refuse to lose weight" as if it's a "conscious choice" to remain unhealthy. That is far from reality. In reality, many people who are actually overweight or obese are struggling to lose weight. They already acknowledge that they are overweight, and they are struggling to lose it because of so many commitments. Portion control and appetite may seem like things you have control over, but in reality, some people naturally have bigger appetites than others and eat bigger portions to feel full. Combined with lack of physical activity in an increasingly convenient world, this causes weight gain in some individuals.
When overweight individuals lose weight, it's no wonder that some people buy those colorful portion-control cups to help them lose weight, while other people already have healthy appetites to feel full. What the YouTube presenter fails to mention is the correlation between poverty in developing countries and slim bodies. If people were poor and food is scarce, then individuals who are genetically predisposed to be overweight would be of normal weight and healthy-looking, while the individuals who are genetically predisposed to be "normal weight" would be extremely thin or dead. I think, in this situation, it's survival of the fattest. So, we should give some credit to people who have the "fat gene", because the fat gene may be a very adaptive trait in an impoverished environment.

I believe that people should be mindful of the genetics aspect of obesity and become more sympathetic and supportive to the struggles of obese individuals in their weight loss journey. We already treat mentally ill individuals with sympathy and care, even though mental illness comes with a social stigma as well. On Quora, formerly overweight individuals report that they feel that they are being treated better by their peers just for being slender and attractive.
The stark difference in treatment between overweight and normal-weight individuals highlights the injustice that overweight people face. If we are to make the world a better place, then we must see the whole picture and understand the psychological profile of obese individuals. With an accurate examination of the person's body and brain, we can effectively treat the person's obesity. For ordinary people who don't have medical expertise, it's not their business to disparage overweight people as "lazy" or "lacking in self-control". Okay, maybe the lack of self-control is partly true, but overweight people are not doing it intentionally.
So, the take-home message is this:
- We should celebrate human diversity. People who are more genetically predisposed to gain weight are more fortunate than people who are more genetically predisposed to be slender in a calorie-deficient environment. Having "good genes" is highly dependent on how your genes adapt to the environment; there is no absolute fitness metric.
- We should recognize the psychology and biology of obesity. Doing so may help us sympathize with overweight individuals and their struggles in losing weight.
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