You might want to check out the Whole Foods forum here at 3FC. It is dedicated to those that concentrate on eating Whole foods
Here is a link to that forum -
You still need to watch your portions because even healthy food can have a lot of calories. I used to have a lot of stomach problems but since eating whole foods, I no longer do.
Also, eating superfoods or whole foods can easily fit into any diet plan. You can count calories, you can do weight watchers, etc.
Dark chocolate still has calories but one benefit of eating dark chocolate is that it is rich and you don't need a lot. I look for 70% cacao minimum and try for 85%. I used to eat a piece of dark chocolate every day but then my weight loss was stalled so I cut that out.