Hi Eva
You mean to say, how body fat to lose through food or diet? It simple , Follow the some important points.
* Don't skip ur meal (because if u skip ur meals , body tends to store the fat for energy so avoid such things).
* Include 4-5 small meals with healthy foods like vegetables, fruits, whole grains, dals, lean meat, skinless chicken, fish, egg white.
* Add more of fat burning foods like vitamin C , fibers & protein rich foods.
* Drink more of fluids like water, fresh fruits juice without sugar, veg juices, soups, green tea.
* More important exercise , do any cardio exercise for 45=60mins in aday & weight training for 20mins daily.