This ‘trend’ of ‘crowding out’ outlined in the US currently is a method of improving your nutrition. Basically the focus is on eating more healthy food. Rather than concerning yourself with reducing the ‘bad stuff’ in your diet. Generally the idea is that this healthy food will then ‘crowd out’ the unhealthy foods.
For example, it is common for many eating patterns to contain a high proportion of refined carbohydrates (e.g. pasta, bread, biscuits, cereals…etc). These are linked to many chronic illnesses such as diabetes, cancer and heart disease. This is particularly true in Western countries
Deliberately focussing on increasing your vegetable intake (e.g. have 2-3 portions with every meal, or aim for 9-10 portions per day) can be a way of ‘crowding out’ the need for refined carbohydrate in your diet.
1. Good Health magazine, July 2015, pg 45