What is a balanced diet?

I feel I should know what this is but I don’t. I know I eat a lot of junk food because it’s easy but I feel I am not healthy because of it.<br><br>I am 5 foot 12 inches and I’m 16 stone in weight. I feel like I shouldn’t be this weight at 22 and I want to get to a healthy weight. Right now I’m just eating one meal a day, which is always KFC or chip shop food.<br><br>I know it isn’t great for me but I don’t know what else to eat. What should I do?