This pairs with the reality that even our fairly recent ancestors had limited access to those nutrients. Honey required getting past bees, wild fruits were small and tart, salt was irregularly available, and fat had to be hunted down and killed. The idea of constant availability of as much fat/sugar/salt as you want, in as many varieties as you can imagine, didn't apply.

Furthermore, the consequences are limited on the time scale that affects natural selection. Humans can reproduce by their teens and raise the child to reproductive age by their 30s, long before obesity is likely to kill you.