What is the fastest way to lose fat without malnutrition?

Fat loss. Eat healthfully ; be physically active. Aim for 7.5 to 8 hrs of sleep / night. Hydrate w at least 64 oz of water / day. Calories burned must > calories consumed. Do both cardio ; weight training. You can mix ; match different kinds of physical exercise. This site helps determine calories burned for > 100 activities: http://www.Prohealth.Com/weightloss/tools/exercise/calculator1_2.Cfm.