Please explain who knows a diet to define muscles?

Yes. Make half your meal vegetables and fruits. Go for variety. And keep in mind that potatoes and french fries dont count. Choose whole grains & limit refined grains. Pick the healthiest sources of protein. Drink lots of water. Stay active. Check out http://www.Sparkpeople.Com or http://www.Myfitnesspal.Com. They offers nutrition, health, and fitness tools, support, and resources that are 100% free.