If you want to lose some weight fast, you must do it effectively and safely, whatever the reason you want to get rid of those kilos. However, you can lose weight of retained water and bowel movements, and thus lose 2.3 kg (5 pounds) or more in one day. However, you should know that you cannot perform this process for more than one day (that is, you cannot lose 6.8 kg or 15 pounds in three days without any mishap), and it is likely that the weight you lose in one day will return Quick. You should maintain a healthy body weight and if you are going to lose weight you should do it along with changes in your long-term lifestyle, such as eating healthy and exercising.
1 Drink plenty of water. Your body needs water to function and if you don't drink enough water every day, your body will retain excess water to compensate for your poor intake.  If you don't currently consume 1.8 liters (64 ounces) of water a day, make it your goal.
You can consume up to 4 liters (135 ounces) of water.
Increase your consumption by 2 to 3 glasses of water a day if you already drink 1.8 liters (64 ounces) of water.
You should know that increasing your water consumption to an unhealthy level can have a bad influence on your sleep patterns, interrupt your daily schedule or cause you discomfort.
You can include clear liquid juices and teas in your calculated consumption.
2 Increase your physical activity. You can burn more calories and eliminate more weight from retained water and exercise depositions.
Walk for 30 minutes at lunchtime and after dinner.
Do not eat snacks at night. This will give your body calories that you don't have time to burn in a day.
Do strenuous activities at home. Sweep, do not vacuum, move all you move and clean under them, clean the railings, etc.
3 Reduce your sodium intake. Sodium consumption causes excessive water retention and can also cause bloating and discomfort. You should eat less than 1500 milligrams of salt a day. 
The easiest way to reduce sodium intake is to eliminate all processed foods. This includes cereals, pastries, cheese, meats, frozen vegetables, canned soups or beans and slices of bread. Salt is a preservative (in addition to a flavoring) and processed foods are rich in salt.
Eat unprocessed foods, such as eggs, wild rice, quinoa, fresh vegetables, fresh fruits, garlic, salads, fresh seafood, unsalted nuts and seeds.
4 Reduce your intake of starch. Like sodium, starch helps your body retain water. If you eliminate starch from your diet, you will retain less water than you consume. To reduce your starch intake, avoid these foods:
pasta and french fries;
bread, cookies and cakes;
roasted rice and potatoes