
Dieting is a common practice, with many people partaking in multiple diets throughout their lifetime. However, the long-term success rates of dieting are often questioned. While calorie-restricted diets can be successful in helping people lose weight, maintaining weight loss is a challenge, and biological, physiological, and environmental factors can impact the success of dieting. The success of dieting is also influenced by individual variability, with some people regaining weight or experiencing health complications. As such, it is important to consider sustainable lifestyle changes and positive body image for long-term success.
| Characteristics | Values |
|---|---|
| Long-term success factors | Food environment, socioeconomics, medical comorbidities, social support, cooking skills, managing job requirements |
| Long-term success rates | 12% kept off at least 75% of weight lost after 3 years; 19% maintained 10% weight loss for 5 years; 97% regain everything within 3 years |
| Long-term success by diet type | Paleo diet has longest compliance times and lowest dropout rates |
| Long-term success and biology | Interactions between diet type and patient genetics or baseline physiology may impact success |
| Long-term success and behavior | Weight-loss behaviors: frequent self-monitoring, reduced calorie intake, smaller meals, increased physical activity, consistently eating breakfast |
| Long-term success and exercise | Exercise may be key to sustained weight loss; 30 minutes of daily physical activity beneficial |
| Long-term success and weight gain | Regain may be higher than reported due to low follow-up rates and self-reported weights |
| Long-term success and health | Weight loss may not lead to a longer, healthier life; obesity paradox shows obese patients with chronic diseases can fare better |
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What You'll Learn

Long-term dieting success is rare
Several factors contribute to the high rate of weight regain after dieting. One factor is a decrease in metabolic rate, which can persist for a long time and to a significant extent. This means that dieters are burning fewer calories than expected, even when accounting for their smaller body size. Another factor is the increase in appetite hormones, which can lead to increased hunger and food intake. Additionally, factors such as the patient’s food environment, socioeconomics, medical comorbidities, and social support, as well as practical factors, such as developing cooking skills, can influence the sustainability of diet adherence.
The diet industry generates billions of dollars annually, preying on people's desire to lose weight. However, weight-loss diets have a disappointing track record, with only a small percentage of people maintaining their weight loss over the long term. For example, in one study, only 12% of participants had kept off at least 75% of their weight loss after three years, while 40% had gained back more weight than they initially lost. Another study found that five years after a group of women lost weight in a six-month program, they weighed, on average, almost eight pounds more than their starting weight.
Some researchers have suggested that dieting may not be the best approach to weight loss and that a focus on health and well-being may be more effective. This includes choosing nourishing foods that satisfy hunger and provide energy, as well as engaging in regular physical activity. Additionally, long-term behavioral changes and ongoing support are crucial for maintaining weight loss. Even short-term interventions are unlikely to yield continued positive outcomes without persisting intervention and support.
While some weight-loss strategies, such as bariatric surgery, can lead to significant weight loss, they also come with risks and potential complications, including long-term malnutrition, intestinal blockages, disordered eating, and even death. Therefore, it is essential to approach weight loss and dieting with caution and prioritize overall health and well-being.
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Dieting can lead to weight gain
Dieting can often lead to weight gain, and there is little evidence that it works in the long term. UCLA researchers analyzed 31 long-term studies and found that most people would have been better off not going on a diet at all. Their weight would be the same, and their bodies would not suffer the "wear and tear" of losing weight and gaining it all back.
The studies showed that people on diets typically lose 5-10% of their starting weight in the first six months. However, at least one-third to two-thirds of dieters regain more weight than they lost within four or five years. The true number may be significantly higher, as many studies have low follow-up rates, and those who respond may not be representative of the entire group, as people who gain back large amounts of weight are unlikely to show up for follow-up tests.
Several studies indicate that dieting is a consistent predictor of future weight gain. One study found that participants in formal weight-loss programs gained significantly more weight over two years than those who had not participated. Another study of 19,000 healthy older men over four years found that one of the best predictors of weight gain was having lost weight on a diet at some point before the study.
There are several reasons why dieting can lead to weight gain. Firstly, dieting can induce metabolic and behavioral changes, causing the body to struggle to regain the lost weight. Secondly, non-biological factors such as the patient's food environment, socioeconomics, medical comorbidities, and social support can play a strong role in determining whether diet adherence is sustainable. For example, a lack of sleep can cause people to gravitate toward junk food instead of healthy meals, hindering weight loss. Finally, dieting can often lead to a preoccupation with food, disinhibition, and moral self-licensing for obesity-prone behavior, which may drive weight gain.
Instead of dieting, it is recommended to focus on eating nourishing foods that keep you satisfied and maintain good energy levels. Eating mindfully, exercising, and managing stress can also help improve your relationship with food and lead to weight loss.
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Weight loss is a priority for many
There are several reasons why dieting may not lead to long-term weight loss. One factor is the body's natural reflex to regain weight after a period of weight loss, which can result in a slower metabolic rate. Additionally, dieting can be difficult to sustain due to factors such as food environment, socioeconomics, and social support. Individual variability also plays a role, with some people finding certain diets more successful than others.
To improve the chances of long-term weight loss, it is important to focus on behavioral changes and ongoing interventions rather than short-term fixes. This includes making healthy eating and exercise habits a priority, such as choosing nourishing foods, eating mindfully, and engaging in physical activity for at least 30 minutes daily. It is also crucial to address any underlying factors that may contribute to weight gain, such as poor body image or medical comorbidities.
While dieting may not always lead to sustained weight loss, it is important to note that the relationship between weight and overall health is complex. Some research suggests that obesity may not always be a direct cause of ill health, and that individuals in the “overweight” or “mildly obese” categories may have lower mortality rates than those at the extreme ends of the BMI spectrum. Additionally, obese patients with chronic diseases have been found to fare better and live longer than those of normal weight.
Ultimately, the decision to prioritize weight loss should consider individual health needs and preferences. While dieting may not always lead to long-term success, adopting healthy behaviors and seeking ongoing support can improve the likelihood of maintaining a healthy weight.
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Non-biological factors determine diet adherence
Long-term dieting studies have shown that dieting does not work for most people. UCLA researchers analyzed 31 long-term studies and found that most participants would have been better off not going on a diet at all. People on diets typically lose 5-10% of their starting weight in the first six months, but at least one-third to two-thirds of dieters regain more weight than they lost within 3-5 years. Another study of 19,000 older men found that one of the best predictors of weight gain over four years was having lost weight on a diet before the study began.
Non-biological factors play a significant role in determining diet adherence and long-term success. These factors include an individual's food environment, socioeconomics, medical comorbidities, and social support. For example, food prices and income can be barriers to choosing and adhering to a healthy diet, especially for low-income individuals. Cultural influences and traditions also impact diet choices and food preparation methods, which can vary across countries. Social context, including the influence of peers and family, also plays a role in an individual's food choices.
Additionally, practical factors such as developing cooking skills and managing job requirements can impact diet adherence. Employed individuals may have more structured daily schedules, which could contribute to better diet adherence. Other factors such as duration of marriage, reason for seeking dietary changes, weight, body mass index (BMI), weight satisfaction, meal times, and sleep patterns have also been found to influence diet adherence.
Behavioral strategies and long-term behavioral changes are crucial for weight loss success. This includes frequent self-monitoring and self-weighing, reduced calorie intake, smaller and more frequent meals, increased physical activity, and consistently eating breakfast. However, maintaining weight loss is challenging and requires significant time, self-discipline, energy, and mental focus. It often involves making lifestyle changes and prioritizing weight maintenance above other aspects of life.
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Dieting may be a predictor of future weight gain
There are several reasons why dieting may lead to future weight gain. One factor is that dieting can cause a decrease in resting metabolic rate, which can make it easier to gain weight in the future. Additionally, the process of losing weight and then regaining it can put wear and tear on the body. The stress and effort of maintaining weight loss can also be mentally and emotionally taxing, leading to what one person described as "intrusive thoughts and food preoccupations."
Individual variability also plays a role in the success of dieting. Factors such as food environment, socioeconomics, medical comorbidities, social support, and practical factors like cooking skills and job requirements can influence whether someone is able to stick to a diet. Biological factors, such as genetics and baseline physiology, may also contribute to the variability in dieting success.
Furthermore, the weight-loss industry has been criticized for promoting the notion that fat is inherently unhealthy and that being thin is always better for one's health. However, studies have found that people in the ""overweight" and "mildly obese" categories actually have the lowest mortality rates. This calls into question the assumption that losing weight will automatically lead to better health.
Instead of focusing on dieting, some experts suggest shifting the emphasis to eating in a way that optimizes health and well-being. This may include choosing nourishing foods, eating mindfully, and incorporating physical activity into one's routine. By prioritizing health instead of weight loss, individuals may be able to improve their overall well-being and maintain a healthy weight in the long term.
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Frequently asked questions
The long-term success rates of dieting are generally low. One study found that 3 years after a weight loss program, only 12% of participants maintained at least 75% of their weight loss, while 40% gained back more weight than they had lost. Another study found that 5 years after a 6-month weight loss program, participants weighed more than their starting weight on average.
The success of dieting in the long term may be influenced by various factors such as food environment, socioeconomics, medical comorbidities, and social support, as well as practical factors like cooking skills and job requirements. Individual characteristics, including genetics, baseline physiology, and insulin sensitivity, may also play a role.
Long-term weight loss requires ongoing commitment and behavioral changes. Successful strategies include frequent self-monitoring and weighing, reduced calorie intake, smaller and more frequent meals, increased physical activity, and consistently eating breakfast. Additionally, certain diets like the Paleo diet have shown longer compliance times and lower dropout rates.










































