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Lior Springfield
If you are preoccupied with food or weight, feel guilt surrounding your food choices, or routinely engage in restrictive diets, consider reaching out for support. These behaviors may indicate a disordered relationship with food or an eating disorder.
Losing 15 pounds in 2 weeks is unrealistic, unsustainable, and likely unsafe. Healthy weight loss is 0.5-2 pounds of weight loss per week, and you may be most likely to do this by changing your diet and modifying your lifestyle.
Watch your drinks. One easy way to lose weight quickly is to cut out liquid calories, such as soda, juice, and alcohol. Replace them with zero-calorie drinks like lemon water, unsweetened tea, or black coffee.
More research is needed to know if fasting is safe long-term. Most studies of the effects of intermittent fasting have been done on overweight, middle-aged adults. More research is needed to determine if it is safe for people who are older or younger or people at a healthy weight.
With the increasing obesity epidemic comes the search for effective dietary approaches for calorie restriction and weight loss. Here I examine whether fasting is the latest 'fad diet' as portrayed in popular media and discuss whether it is a safe and effective approach or whether it is an idiosyncratic diet trend that promotes short-term weight loss, with no concern for long-term weight maintenance. Fasting has long been used under historical and experimental conditions and has recently been popularised by 'intermittent fasting' or 'modified fasting' regimes, in which a very low-calorie allowance is allowed, on alternate days (ADF) or 2 days a week (5:2 diet), where 'normal' eating is resumed on non-diet days. It is a simple concept, which makes it easy to follow with no difficult calorie counting every other day. This approach does seem to promote weight loss, but is linked to hunger, which can be a limiting factor for maintaining food restriction. The potential health benefits of fasting can be related to both the acute food restriction and chronic influence of weight loss; the long-term effect of chronic food restriction in humans is not yet clear, but may be a potentially interesting future dietary strategy for longevity, particularly given the overweight epidemic. One approach does not fit all in the quest to achieve body weight control, but this could be a dietary strategy for consideration. With the obesity epidemic comes the search for dietary strategies to (i) prevent weight gain, (ii) promote weight loss and (iii) prevent weight regain. With over half of the population of the United Kingdom and other developed countries being collectively overweight or obese, there is considerable pressure to achieve these goals, from both a public health and a clinical perspective. Certainly not one dietary approach will solve these complex problems. Although there is some long-term success with gastric surgical options for morbid obesity, there is still a requirement for dietary approaches for weight management for the overweight and obese population, particularly as invasive interventions carry post-operative risk of death due to complications. Effective dietary interventions are required that promote long-term adherence and sustained beneficial effects on metabolic and disease markers. In general, such interventions need to be palatable and satiating, meet minimal nutritional requirements, promote loss of fat and preserve lean body mass, ensure long-term safety, be simple to administer and monitor and have widespread public health utility. Intermittent fasting or alternate day fasting may be an option for achieving weight loss and maintenance.
Weight loss, in the context of medicine, health, or physical fitness, refers to a reduction of the total body mass, by a mean loss of fluid, body fat (adipose tissue), or lean mass (namely bone mineral deposits, muscle, tendon, and other connective tissue). Weight loss can either occur unintentionally because of malnourishment or an underlying disease, or from a conscious effort to improve an actual or perceived overweight or obese state. "Unexplained" weight loss that is not caused by reduction in calorific intake or increase in exercise is called cachexia and may be a symptom of a serious medical condition.
Intentional weight loss is the loss of total body mass as a result of efforts to improve fitness and health, or to change appearance through slimming. Weight loss is the main treatment for obesity,[1][2][3] and there is substantial evidence this can prevent progression from prediabetes to type 2 diabetes with a 7-10% weight loss and manage cardiometabolic health for diabetic people with a 5-15% weight loss.[4]
Weight loss in individuals who are overweight or obese can reduce health risks,[5] increase fitness,[6] and may delay the onset of diabetes.[5] It could reduce pain and increase movement in people with osteoarthritis of the knee.[6] Weight loss can lead to a reduction in hypertension (high blood pressure), however whether this reduces hypertension-related harm is unclear.[5][failed verification] Weight loss is achieved by adopting a lifestyle in which fewer calories are consumed than are expended.[7] Depression, stress or boredom may contribute to weight increase,[8] 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 much fat as sleep-deprived dieters.[9][10] Though hypothesized that supplementation of vitamin D may help, studies do not support this.[11] The majority of dieters regain weight over the long term.[12] According to the UK National Health Service and the Dietary Guidelines for Americans, those who achieve and manage a healthy weight do so most successfully by being careful to consume just enough calories to meet their needs, and being physically active.[13][7]
For weight loss to be permanent, changes in diet and lifestyle must be permanent as well.[14][15][16] There is evidence that counseling or exercise alone do not result in weight loss, whereas dieting alone results in meaningful long-term weight loss, and a combination of dieting and exercise provides the best results.[17] Meal replacements, orlistat, a very-low-calorie diet, and primary care intensive medical interventions can also support meaningful weight loss.[18][19]
The least intrusive weight loss methods, and those most often recommended, are adjustments to eating patterns and increased physical activity, generally in the form of exercise.[20] The World Health Organization recommends that people combine a reduction of processed foods high in saturated fats, sugar and salt,[21] and reduced caloric intake with an increase in physical activity.[22] Both long-term exercise programs and anti-obesity medications reduce abdominal fat volume.[23]Self-monitoring of diet, exercise, and weight are beneficial strategies for weight loss,[20][24][25] particularly early in weight loss programs.[26] Research indicates that those who log their foods about three times per day and about 20 times per month are more likely to achieve clinically significant weight loss.[20][27]
Permanent weight loss depends on maintaining a negative energy balance and not the type of macronutrients (such as carbohydrate) consumed.[28] High protein diets have shown greater efficacy in the short term (under 12 months) for people eating ad libitum due to increased thermogenesis and satiety, however this effect tends to dissipate over time.[29]
Other methods of weight loss include use of anti-obesity drugs that decrease appetite, block fat absorption, or reduce stomach volume.[citation needed] Obesity has been resistant to drug-based therapies, with a 2021 review stating that existing medications are "often delivering insufficient efficacy and dubious safety".[30]
There is a substantial market for products which claim to make weight loss easier, quicker, cheaper, more reliable, or less painful. These include books, DVDs, CDs, cremes, lotions, pills, rings and earrings, body wraps, body belts and other materials, fitness centers, clinics, personal coaches, weight loss groups, and food products and supplements.[33] Dietary supplements, though widely used, are not considered a healthy option for weight loss, and have no clinical evidence of efficacy.[34] Herbal products have not been shown to be effective.[35]
In 2008, between US$33 billion and $55 billion was spent annually in the US on weight-loss products and services, including medical procedures and pharmaceuticals, with weight-loss centers taking between 6 and 12 percent of total annual expenditure. Over $1.6 billion per year was spent on weight-loss supplements. About 70 percent of Americans' dieting attempts are of a self-help nature.[36][37]
The scientific soundness of commercial diets by commercial weight management organizations varies widely, being previously non-evidence-based, so there is only limited evidence supporting their use, because of high attrition rates.[38][39][40][41][42][43] Commercial diets result in modest weight loss in the long term, with similar results regardless of the brand,[40][42][44][45] and similarly to non-commercial diets and standard care.[38][3] Comprehensive diet programs, providing counseling and targets for calorie intake, are more efficient than dieting without guidance ("self-help"),[38][46][45] although the evidence is very limited.[43] The National Institute for Health and Care Excellence devised a set of essential criteria to be met by commercial weight management organizations to be approved.[41]
Unintentional weight loss may result from loss of body fats, loss of body fluids, muscle atrophy, or a combination of these.[47][48] It is generally regarded as a medical problem when at least 10% of a person's body weight has been lost in six months[47][49] or 5% in the last month.[50] Another criterion used for assessing weight that is too low is the body mass index (BMI).[51] However, even lesser amounts of weight loss can be a cause for serious concern in a frail elderly person.[52]
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