Studies show that people who eat breakfast have less body fat than people who skip breakfast. But what you have for breakfast makes a difference, too. Danish researchers compared three groups of volunteers—those who ate no breakfast with those who either ate high-protein or high-carb to confirm a protein-rich breakfast results in great satiety or feeling of fullness It also improves ability to concentrate compared to high-carb and high-fat foods with the same calorie count. The study involving a small group of overweight young women, was published in the peer-reviewed Journal of Dairy Science. Authors say it is intriguing that there can be such a big difference in the satiety effect of two different meals with the same calorie content.