Well the reason they are negative traits, is because that's the ones we keep track of in medical records. Anyway all these traits are only slightly correlated

Well the reason they are negative traits, is because that's the ones we keep track of in medical records. Anyway all these traits are only slightly correlated with those conditions. Just because you have the depression genes, doesn't mean you will even likely have depression. It looks like only 2% get it. They could also be reactions to modern environments. E.g. people get less sunlight, which means less vitamin D, which is linked to depression. Similar things with obesity, that would have been less common in prehistoric times, and is linked to many other conditions.