What is the 80/20 rule for a balanced diet?
The 80/20 rule encourages you to eat balanced meals. If you can manage 80% of your meals to be clean that leaves room for 20% to come from non-compliant meals.
The knowledge that you are not restricted to a certain type of diet and that you can indulge in some chocolate if you are craving it, motivates you to stick to the 80/20 plan. This makes for sustainable habits, which do not feel intimidating and better you at reaching your fitness goals.
Moreover, it reduces your chances of relapsing to old eating patterns, as you will be practicing moderation.