And searching for the gene for obesity may be like searching for the gene to discover who will get lung cancer once they smoke. Yes, it would be interesting, but the cause of the lung cancer is smoking, not biology. What's causing obesity rates to soar must be something that has changed recently. The prevalence of obesity has increased dramatically since 1980. And obesity is on the rise in country after country, as each becomes more like America.
Evolution takes millions of years.
We ignore the obvious. I believe that Americans are exposed to a toxic food environment. The word 'toxic' is not too strong. There are dangerous agents in the environment that are widely available and that cause people to be sick. Either way, the environment is terrible.