Children with poor eating habits don’t get the amounts of nutrients they need for healthy growth and development. This can lead to being underweight or overweight. Children who are poorly nourished tend to have weaker immune systems, which increases their chances of illness. They are more likely to develop certain long-term health problems.

https://healthy.kaiserpermanente.org/health-wellness/health-encyclopedia/he.healthy-eating-in-children-problems-caused-by-poor-nutrition.ug2061