Lovely post Jasmin.
Healthy eating isn't all that complicating, agreed. And as you rightly said, MODERATION is key.
However, I think there are instances in which one should be disciplined in choosing what to eat and what not to eat, as in the case of a poorly managed Diabetes mellitus. In such instances, one must be able to say no to some meals.
Still on diet, I'll love to share what i found on a journal, a study showed that patients with type 2 diabetes can reverse the condition if they stick to a very low calorie liquid diet, around 850kcal/day for 3-5months.
SOURCE: http://www.bbc.co.uk/news/health-42154666.

Cheers!