Do high intensity interval training (HIIT). HIIT is an exercise program that alternates intense exercises with short intervals of recovery or rest. This type of exercise will help you burn fat fast. High intensity exercises force your body to use the sugars in your body and allows you to burn fat faster than low intensity workouts. You will also use stored body fat during the recovery phase, which will reduce your stored body fat. You can perform HIIT exercises with gym equipment, or an exercise mat and a few free weights. There are several popular HIIT programs, including:[13]
Gabel, K., Hoddy, K. K., Haggerty, N., Song, J., Kroeger, C. M., Trepanowski, J. F., … Varady, K. A. (2018, June 15). Effects of 8-hour time restricted feeding on body weight and metabolic disease risk factors in obese adults: A pilot study. Nutrition and Healthy Aging, 4(4), 345–353. Retrieved from https://content.iospress.com/articles/nutrition-and-healthy-aging/nha170036
If you want to lose a small amount of weight quickly, you should do so effectively and safely, no matter your reason for wanting to shed pounds. However, you can safely shed weight from retained water and waste, and lose 5 lbs. (2.3 kg) or more within one day. Be aware, though, that this process cannot be safely repeated for more than one day (i.e. you cannot safely lose 15 pounds in three days), and the weight that you lose in one day is likely to return quickly. It is smart to maintain a healthy body weight, and weight loss should be combined with long-term lifestyle changes, like eating healthy and exercising.
Based on my experience in nutrition counseling, most of us tend to snack on foods that aren’t nutrient-dense, but are high in calories. For example, skipping sugary beverages is often the easiest way to lose weight faster. You don’t feel full from drinks — even the ones that do contain calories — so swapping those out for sparkling water or unsweetened tea and coffee is the best place to start. Other major culprits often come in refined grains like cereals, chips, crackers, and cookies. 
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