Intentional weight loss refers to the loss of total body mass as a result of efforts to improve fitness and health , and / or to change appearance.
Weight loss in overweight or obese can reduce health risks , increase health, and can delay the onset of diabetes. One could reduce pain and increase movement in people with osteoarthritis of the knee. weight loss can lead to a reduction in hypertension (high blood pressure), however if this reduces damage related to hypertension is not clear .
Weight loss occurs when a person is in a state of negative thermodynamic flux : when the body is spending more energy ( ie in work and metabolism ) than it is consuming ( ie from food and other supplements nutritional ) , used as the stocks of fat or muscle , which gradually leads to weight loss .
It is not uncommon for some people who are at their ideal to seek additional weight loss in order to improve athletic performance or meet the required classification for participation in a sport weight body weight. Others may be driven to lose weight for a more attractive appearance. Being underweight is associated with health risks such as difficulty fighting off infection , osteoporosis, decreased muscle strength, trouble regulating body temperature and even increased risk of death .
According to the U.S. Food and Drug Administration ( FDA) , healthy individuals seeking to maintain their weight should consume 2,000 calories per day .
According to the Dietary Guidelines for Americans who achieve and manage a healthy weight , do so with great success , taking care to consume only enough calories to meet their needs, and being physically active .
Diets low calorie diet also called balanced percentage diets. Due to their minimal detrimental effects , these types of diets are most commonly recommended by nutritionists . In addition to restricting calorie intake , a balanced diet also regulates macronutrient consumption . From the total number of allotted daily calories , it is recommended that 55 % should come from carbohydrates, 15 % protein, and 30 % from fats with no more than 10% of total fat coming from saturated forms . For example , a recommended 1,200 calorie diet would provide about 660 calories from carbohydrates, protein 180 , and 360 of the fat . Some studies suggest that increased consumption of protein can help alleviate hunger sensation associated with reduced caloric intake by increasing satiety . [22 ] The restriction of calories this way has many long-term benefits . After reaching the desired body weight , calories consumed per day may be increased gradually , without exceeding 2,000 net ( ie derived by subtracting calories burned by physical activity from calories consumed ) . Combined with increased physical activity , low -calorie diets in the long term are believed to be most effective long term , unlike crash diets which can achieve short term results, at best. Physical activity may greatly enhance the efficiency of a diet . The scheme healthier weight loss , therefore , is what is a balanced diet and moderate physical activity. [ Citation needed ]
Weight gain has been associated with excessive consumption of fats , sugars , carbohydrates in general, and alcohol. [Citation needed] Depression , stress or boredom may also contribute to weight gain ,  and in these cases , individuals are advised to seek medical help. A 2010 study found that dieters who got a full night’s sleep lost more than twice as fat dieters sleep deprived .
Most dieters regain weight over time.
Some research suggests that all calories are not equal (in other words , a calorie is a calorie not necessarily ) . Thus, the human body could not get the same amount of weight from 500 calories of certain foods that would do 500 calories from other foods.
Techniques of therapeutic weight loss
See also: Management of obesity , bariatric , and virtual gastric band
Methods less intrusive weight loss , and most often recommended , are adjustments to eating patterns and increased physical activity, generally in the form of exercise. The World Health Organization recommends that people combine a reduction of processed foods rich in saturated fats , sugar and salt and caloric content of the diet with increased physical activity.
It is also recommended an increase in fiber intake to regulate bowel movements.
Other methods of weight loss include use of drugs and supplements that decrease appetite , block fat absorption , or reduce stomach volume .
Bariatric surgery may be indicated in cases of severe obesity. Two common bariatric surgical procedures are gastric bypass and gastric banding. Both can be effective in limiting the power consumption of food by reducing the size of the stomach , but as with any surgical procedure both come with their own risks should be considered in consultation with a physician .
Dietary supplements, though widely used , are not considered a healthy option for weight loss . Although a lot are available , very few are effective in the long term .
Virtual gastric band uses hypnosis to make the brain think the stomach is smaller than it really is and therefore reduce the amount of food eaten . This results in weight reduction . This method is complemented with psychological treatment for anxiety management and with Hypnopedia . Research has been conducted on the use of hypnosis as an alternative weight control . In 1996, a study found that cognitive behavioral therapy (CBT ) was more effective in reducing weight if reinforced with hypnosis. Acceptance and Commitment Therapy ACT, a focus of attention to weight loss , has also in recent years have shown their usefulness.
A crash diet
A crash diet refers to willful nutritional restriction ( except water) for more than 12 waking hours. The desired result is to have the body burn fat for energy with the goal of losing a significant amount of weight in a short time. Crash dieting can be dangerous to health and this method of weight loss is not recommended by doctors.
According to the Academy of Nutrition and Dietetics, ” If the diet or product sounds too good to be true, it probably is . No food or pills that magically burn fat. No super foods will alter your genetic code . products will not miraculously melt fat while watching TV or sleeping. ” Certain ingredients in supplements and herbal products [ vague ] can be dangerous and even fatal for some people. [ Citation needed ]
Industry weight loss
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The examples and perspective in this section deal primarily with the U.S. does not represent a worldwide view of the subject. Please improve this article or discuss the issue on the talk page. ( December 2010 )
There is a significant market for products that promise to make it easier weight loss , faster, cheaper, more reliable, or less painful. These include books, DVDs , CDs , creams , lotions, pills , rings and earrings , body wraps , belts and other materials , fitness centers , personal coaches, weight loss groups , and food products and supplements .
In 2008 US $ 33 billion and $ 55 billion is spent annually in the U.S. on products and services for weight loss , including medical procedures and pharmaceuticals , with weight loss centers that have between 6 and 12 percent of total annual expenditure . More than 1.6 million dollars a year is spent on weight loss supplements . About 70 percent of diet attempts of Americans are self-help nature . Although often short-lived , these diet fads are a positive trend for this sector as Americans ultimately turn to professionals to help them achieve their weight loss goals .
In Western Europe , sales of weight-loss products , excluding prescription medications, topped £ 900 million ( 1.4 billion) in 2009.