You have raised an interesting question. Is Obesity genetic? Is there anything you can do about your difficulty loosing weight?
1) We now believe that obesity is genetic to some degree. Some families do have a predisposition to gaining more weight than others and also to needing to eat more in order to feel satisfied.
2) There are some people who become obese purely for hormonal reasons ie those who suffer from Willi-Prader syndrome. Doctors have thought this is a rare condition, but scientists are now thinking that many people who are obese may have a lesser variant of this condition. Even being pregnant predisposes some women to becoming obese. Also, the more obese a person becomes, the more hormones change to make the person want to eat more - and to gain more weight.
3) Some people have addiction in the family - ie people who are obese (especially if they are food addicts) often have alcoholism or drug addiction in their family history.
You can see that obesity is very complex, and that none of it is the fault of the individual.
This does not mean that the person has no responsibility to change their lifestyle. All of these conditions can be managed, and the obese person has to be willing to make changes that other people may not have to do. We have found that removing sugar, processed starchy foods and soda and adding vegetables and protein controls most of these conditions. The person who develops diabetes as well as becoming obese will likely benefit the most from these changes.
I suggest that you try this and if you find that you have difficulties, you may actually be a food addict. If so, please look at my website: addictionsunplugged.com.