If you eat fruit breakfast no lunch then healthy dinner will you lose weight?

Simply yes, if you follow a simple metabolic equation. The question you have asked is perhaps not the best way to achieve an answer that can help you lose weight, but, if you use less energy than you consume through food, and eat enough to prevent your body from going into starvation mode, you can eat whenever you want. If you, however, consume more energy/food than you use (healthy or unhealthy), you will store the surplus energy for another day. This is stored as fat. Eating more, smaller meals can improve metabolic efficiency by up to 15%, but this just makes your body more efficient at burning calories. It DOES NOT have to be done to lose weight. If you do not have an understanding of biological metabolic function, I will explain now for you to help understand. The human body requires fuel/energy to grow muscle, reproduce cells, make your heart work etc. This energy comes in food, and is calculated using the measurement of calories. Just to live life in it