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.
Eat more of foods that fill you up. Some foods help you feel full faster and may help you stay fuller longer. Many of these foods contain protein, fat, or fiber. However, foods that help keep your blood sugar stable are also great options, as this helps you keep your appetite in check. Here are some great foods to incorporate if you want to feel fuller longer:[7]

While few would suggest you start hitting up the tanning beds for better health, getting some natural sunlight can help you get rid of belly fat in a matter of weeks. Researchers at the Fred Hutchinson Cancer Research Center found that vitamin D-deficient overweight women between 50 and 75 who upped their intake of the so-called sunshine vitamin shed more weight and body fat than those who didn't. To practice safe sun, make sure you're limiting yourself to 15 sunscreen-free minutes per day.

Lose fat with high-intensity interval training (HIIT). If you're trying to lose weight fast, HIIT training can super-charge your metabolism for upwards of 24 hours after exercising.[27] This means your body will continue burning calories long after you've ended your workout. HIIT burns more calories in less time than steady-state cardio. In one study, researchers looked at two groups, one running for 30 to 60 minutes three times per week, the other doing four to six 30-second treadmill sprints, resting for four to six minutes between each sprint. After six weeks, it was found that the group doing HIIT training lost more weight.[28]
When researchers at the University of Tennessee put a group of volunteers on one of two diets—one high in calcium and one not—and cut each group’s calorie intake by 500 calories, they found that the people getting calcium lost twice as much weight (an average of 13lbs) compared with people on the standard diet. Study author Michael Zemel, Ph.D., believes extra calcium helps the body burn more—and store less—fat.
To stay motivated and deal with cravings, Juge has a couple of great recommendations. First, schedule a cheat meal on every seventh day. "Many of my clients have their cheat meal on Sunday, so then they're ready for Monday and the week to come," he says. If you feel deprived during the week, concentrate on the cheat meal to come, knowing you can eat absolutely anything you want to—pizza, lasagna, doughnuts, beer, chips, you name it. Remember, though, it's just one cheat meal, not an entire day of cheating. Afterward, get right back on the wagon with your next scheduled meal.
Some men can lose up to 5 lbs. per week, says Juge, if they follow the diet strictly. He recommends striving for a weekly 2- to 3-lb. loss for more lasting effects. "That way it's not such a drastic change and you'll be less likely to put all the weight back on when the diet's done," he adds. Weigh yourself naked just once per week, at the same time, preferably on the same scale. That way it'll be as accurate as possible.
It’s pretty common for men to pack some extra poundage around their midsection. In fact, the average man is about 24lbs heavier today than men in 1960, according to stats from The State of Obesity—and the figures are rising. We’ve seen slimmer days, but don’t think this is a grim sentence, dooming you to eternal chubbiness. There are dozens, if not hundreds, of ways for you to burn belly fat—fast.
If you're not up for crunching numbers every day, you can take a more generalized approach. “For some people, it’s knowing, ‘Typically I eat a whole sandwich,’” says Gagliardi. “Now, I’m going to eat half a sandwich at lunch and save the other half for my dinner and cut my calories in half." To get started, consider these 25 ways to cut 500 calories a day.
Your body can store about 300-500 grams of carbs in the form of glycogen, which is known to hold about thrice the amount of water weight. A reduction in the level of insulin in your body will also result in your kidneys shedding out excess sodium which will ultimately lead to reduced water retention. Apart from reducing body fat and water weight, your body may also shed some kilos due to undigested food and fiber as well as less intestinal wastage in your digestive system. Here are 7 simple steps to follow to lose weight in 7 days:

Have a small, protein-heavy breakfast. Kickstart your day with a protein filled breakfast that will give you energy (and keep your blood sugar up) for the rest of the day. Aim for a breakfast that is 400 calories and eat it every morning at around the same time. Go for variety and rotate two to three options. Pair your breakfast with unsweetened tea or a glass of water with lemon.[6]
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