How can bad diet as a child (mostly greasy salty fried meats and potatoes) influence growth?i'm now 23, very underweight and generally fatigued.

Not too late!: Childhood is a time of critical growth in which proper nutrition is absolutely necessary. Children who have poor diets are prone to significant short-term and long-term health impacts and diseases such as obesity, mental and emotional health problems, and a failure to thrive. It’s never too late to make correct diet choices. You can turn this around. Start right now! “You are what you eat”