How long does it *really* take to lose 15 pounds? “The safest and most sustainable timeline to lose about 15 pounds would be about two to four months,” says Jonathan Valdez, RDN, towner of Genki Nutrition and spokesperson for New York State Academy of Nutrition and Dietetics.
Losing 15 lb (6.8 kg) in 2 weeks, or 7.5 lb (3.4 kg) per week, would require creating a daily deficit of about 3,500 calories. To achieve this, you'd need to adopt an extremely low-calorie diet and do lots of vigorous exercise every day, so it's not recommended.
You won't lose 15 pounds in a week, unless you're a morbidly obese man. Despite all the working out and the carefully measured healthy food, it's not realistic for a person who is not morbidly obese to lose that amount of weight in seven days.
There is no amount of exercise that you can do in the span of two weeks that can allow you to shed 15 pounds in 14 days. For you to lose 1 pound of fat a day, you have to burn about 3500 calories (4).
No matter how alluring it may sound, it is not recommended to lose 15 pounds in two weeks. Evidence shows that a more gradual weight loss is more successful than a rapid one. Losing weight is not about going on a diet, quickly shedding pounds, and then getting back to your regular life.
On average, a 15 to 20-pound loss (approximately 2 to 5 percent of your starting body weight) is enough to notice "significant changes in your body," he said. You can start seeing differences in yourself as early as two weeks with rapid weight loss.
Fast weight loss, such as losing 10 pounds in a week, is possible — but it's usually not worth it. In fact, it could be detrimental to your physical and mental health. In reality, plans and programs that promise rapid weight loss or extreme results are best avoided.
In order to achieve weight loss, you should increase your intake of fruits, vegetables and food that is rich in fiber. Is is possible to lose between 5 to 10 pounds in 2 weeks, although this weight loss will vary depending on each person's metabolism.
Therefore, aiming to lose 1 pound (0.5 kg) per day may be unsustainable, unrealistic, and potentially dangerous. Losing 1 pound (0.5 kg) per day involves drastically reducing your calorie intake and increasing your physical activity. Very low calorie diets and excessive exercise may both be unhealthy and unsustainable.
Here is the math: 1 pound of fat = 3500 calories 3500 calories x 15 pounds = 52,500 calories (total caloric deficit to lose 15 pounds) 52,500 / 30 days = 1750 calorie deficit per day.
The first place men typically lose weight is the belly, while women tend to lose weight all over, but hold onto weight in their thighs and hips, Dr. Block explains.
“Women and men of average height need to gain or lose about three and a half and four kilograms, or about eight and nine pounds, respectively, for anyone to see it in their face,” said Nicholas Rule, associate professor in the Faculty of Arts & Science and Canada Research Chair in Social Perception and Cognition.
But do you really know what's realistic? Over the long term, it's smart to aim for losing 1 to 2 pounds (0.5 to 1 kilogram) a week. Generally to lose 1 to 2 pounds a week, you need to burn 500 to 1,000 calories more than you consume each day, through a lower calorie diet and regular physical activity.
Rapid weight loss diet is a type of diet in which you lose more than 2 pounds (1 kilogram, kg) a week over several weeks. To lose weight this quickly you eat very few calories.
According to many experts, losing 1–2 pounds (0.45–0.9 kg) per week is a healthy and safe rate (1, 2, 3 ). Losing more than that is considered too fast and could put you at risk of many health problems, including muscle loss, gallstones, nutritional deficiencies and a drop in metabolism ( 4 , 6 , 7 , 8 ).
BOTTOM LINE: Although the boiled egg diet encourages eating healthy food groups and may promote short-term weight loss, it's overly restrictive and unsustainable. Any weight you lose may be regained once you return to your typical eating pattern.