"Not only that, those who eat breakfast learn better as they have better energy levels and concentration, they are more active and have a healthy weight. It also sets them up with healthy habits so they become healthy adults," she said.
Healthy schools co-ordinator Kathryn Cannan said she had questions about the root cause of the problem, which needed to be answered before a decision was made on how to combat it.
Ms Brand said some of the most nutritious breakfast options were the most affordable, such as wheat biscuits and rolled oats. Those who found it hard to stomach food in the morning could try a smoothie or a banana wrapped in a piece of wholegrain bread.
The average serving of energy drink V has seven teaspoons of sugar, according to Community and Public Health figures.