Skinny genes the 'secret to staying slim'

No, it is for your body to not take in more calories than your body uses. Some bodies may not take in all excess calories you eat, just as a car doesn’t use more gas if you keep the gas topped up, or do take them in, but have ways to burn them of instead of storing them in fat (say by moving more blood through the skin), just as some oil refineries flare off gas that they don’t need, rather than storing it and becoming larger and larger over time.

So, eating too much is the cause, but what constitutes too much can depend on the person. If your digestive system has a hard limit on the amount of stuff it can take in, it may even be impossible for you to become obese.

No. It says that thinness is genetically determined. Yes one is the flip side of the other, I don't think that allows the 'severe' though.

Professors should surely be choosing their words more wisely.

It is a huge difference. But, it doesn't matter. Some people can eat more than others and not get fat. There is no justice in the universe ;-). Whether it is some gene, your body size, your age or something else, it doesn't matter. Eat too much and you will get fat. Don't eat too much and you won't get fat.

That last bit is super important. There is no illness that causes people to starve to death even when obese. Your body is a factor, not an excuse (Ha ha! Here I am quoting Arnold!)

But correct that it might be genes was observed in the dutch population generations after early nineteen hundredth's famine crisis: [ https://www.nytimes.com/2018/01/31/science/dutch-famine-gene... ]. This eventualley led to a new area of study called epigenetics (of which one of the pioneers actually earnes a Nobel's Prize I think). Epigenetic research has shown that genes are not final. In the case of the dutch famine, the famine-victims which survived had undergone epifenetic changes (their genes changed) in response to the famine, their body would become extremely energy efficient and their energy partitioning would lean towards buildup of adipose tissue (fat). However (!!) research later shown that these gene alteration which their offspring inherited and which were observed throughout the dutch poulation generations later, was reversible by environmental factors and exercise.

A certain gene might make you feel hungry more, and will make you eat more, and will make you bigger.

Another gene might cause someone to prefer certain foods, and again cause a difference in body weight.

Pretending that everyone is the same is pointless. Someone who doesn't feel hungry much might say, it's easy, just eat less. But that advise is pointless for someone who constantly craves food -- eating less might be incredibly hard for one person while it is incredible easy for another.

The article presents some evidence that our genetic makeup has an influence on our body weight. Lets not dismiss it just because it doesn't fit in to the world view of "everyone is the same".