Leena Watts
Fad diets are extremely popular for losing weight. They typically promise rapid weight loss and other health benefits, yet often lack scientific evidence supporting their use. Fad diets are usually nutritionally unbalanced and ineffective over the long term. However, there are some fad diets that have been found to produce weight loss in high-quality, controlled studies. Fad diets can be differentiated from healthy and balanced diets based on their characteristic features: they promise rapid weight loss, lack physical activity guidelines, promote short-term changes, focus on one type of food or eliminate food groups, cannot be maintained for a long period, and fail to provide health warnings for those with chronic diseases. Examples of fad diets include the Atkins diet, the Ketogenic (Keto) Diet, the Paleo Diet, the 5:2 diet, the Mediterranean diet, the Inuit diet, the Cabbage Soup diet, the Grapefruit diet, and the Subway diet.
| Characteristics | Values |
|---|---|
| Promise of quick and easy weight loss | Rapid weight loss, often through water weight and muscle loss |
| Nutritional inadequacy | Lack of essential nutrients or food groups, leading to potential nutrient deficiencies |
| Lack of scientific evidence | Unbalanced diets, lack of long-term sustainability, and potential negative health consequences |
| Appeal | Quick-fix, miracle solutions with specific claims |
| Examples | Atkins, Keto, Paleo, Gluten-free, Special K, Grapefruit, Intermittent Fasting, Detox, Mediterranean, Vegetarian, Vegan, DASH, Sirtfood |
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What You'll Learn
Low-carb diets, e.g. Atkins, Ketogenic, South Beach
Low-carb diets are a popular category of fad diets, with the Atkins, Ketogenic, and South Beach diets being the most well-known examples. These diets promote a significant reduction in carbohydrate intake, with the goal of inducing weight loss and improving overall health.
The Atkins diet is a well-known low-carb diet that has been around for many years. It involves consuming high-protein, low-carb, and low-sugar meals and snacks. The Atkins diet does not involve restrictive counting or plans and instead focuses on enjoying fresh, delicious food while achieving weight wellness. Atkins offers a range of products, including frozen meals, shakes, bars, and treats, making it convenient for people to follow the diet.
The Ketogenic diet, also known as the keto diet, is another popular low-carb approach. It is a very low-carb, high-fat diet that shares similarities with the Atkins and other low-carb diets. The keto diet involves drastically reducing carbohydrate intake and replacing it with fat, which puts the body into a metabolic state called ketosis. In ketosis, the body uses fat for fuel instead of carbohydrates, leading to weight loss and potential health benefits such as lower blood sugar and insulin levels. There are several versions of the keto diet, including the standard ketogenic diet (SKD), cyclical ketogenic diet (CKD), targeted ketogenic diet (TKD), and high protein ketogenic diet.
The South Beach diet is another low-carb diet that has gained popularity. It is designed to promote weight loss and improve overall health. The South Beach diet emphasizes the consumption of lean protein, healthy fats, and high-fiber carbohydrates, while limiting processed carbohydrates and sugars. The diet is typically divided into three phases, with each phase having specific food recommendations and portion sizes.
While low-carb diets like Atkins, Ketogenic, and South Beach may offer weight loss benefits, it is important to approach them with caution. Reducing carbohydrate intake can lead to initial side effects, such as fatigue and brain fog, and long-term adherence to these diets may not be sustainable for everyone. Additionally, carbohydrates are the main source of energy for the body, and a drastic reduction may not be suitable for all individuals or activity levels. As with any diet, it is always recommended to consult with a healthcare professional or registered dietitian before making significant changes to your eating habits.
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Detox diets, e.g. juice fasts, lemon juice/maple syrup/cayenne pepper drink
Detox diets are short-term dietary plans that claim to remove toxins from the body, aid weight loss, and promote health. Detox diets are based on the idea that harmful toxins from the air, water, and food are stored in the body's tissues, fat cells, and bone, which can lead to weight gain and health issues. These toxins include pollutants, heavy metals, chemicals, and pesticides.
Detox diets often involve restrictive eating, such as fasting or drinking only juices, along with supplements, herbs, and sometimes colon cleanses. While many people report feeling better and losing weight after a detox, it is likely due to cutting out unhealthy foods and reducing calorie intake rather than the removal of toxins. There is limited scientific evidence to support the effectiveness of detox diets in removing toxins, as the liver and kidneys naturally filter out harmful substances.
One example of a detox diet is the lemon detox diet, which involves consuming only a mixture of organic maple or palm syrup and lemon juice for seven days. Another popular detox method is juice cleansing, where solid foods are replaced with fruit and vegetable juices. Some people also incorporate supplements and herbs into their detox diets, such as green tea, milk thistle, turmeric, and dandelion root, which are believed to support the body's detoxification process.
It is important to note that detox diets can have side effects, and some may pose health risks due to nutritional inadequacy. Colon cleansing, for example, can cause dehydration, cramping, bloating, nausea, and vomiting. Additionally, there is a lack of regulation in the detox industry, and some detox products have been found to contain illegal or harmful ingredients. Before starting any detox diet, it is recommended to consult a healthcare professional to ensure safety and address potential risks.
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Intermittent fasting, e.g. 5:2, alternate-day fasting
Intermittent fasting is a type of fad diet that involves cycling between voluntary fasting (or reduced calorie intake) and non-fasting over a given period. It is supposed to help with obesity, insulin resistance, dyslipidemia, hypertension, and inflammation. There are three main forms of this diet: alternate-day fasting, periodic fasting, and time-restricted eating.
Alternate-day fasting involves partial intermittent energy restriction, which means that on fasting days, you can consume up to 25% of your daily calorie needs. This equates to around 500-600 calories, or about 25% of regular daily caloric intake, and you eat normally for the rest of the week.
Periodic fasting involves intermittent periods of water fasting longer than 24 hours. The 5:2 diet is a type of periodic fasting that does not follow a particular food pattern but focuses entirely on calorie content.
Time-restricted eating is a form of daily intermittent fasting where people eat only during a certain number of hours each day. This might involve eating only during an eight-hour window each day or restricting eating to certain hours on certain days.
A 2019 review concluded that intermittent fasting may be beneficial, but the science is uncertain due to a lack of studies on its long-term effects. There is also a concern about the risk of diarrhea. Some studies have shown that it can be effective for weight loss, but it may not be sustainable long-term.
Compliance is generally high (over 80%) in trials shorter than three months. However, it is important to consult a physician before starting this diet, as fasting can sometimes be unsafe.
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Extreme diets, e.g. liquid diets, grapefruit diet, cabbage soup diet
Fad diets are trendy weight-loss plans that are often short-lived and may not be backed by solid scientific evidence. Some of these diets can be extreme and may not be safe or effective for long-term weight loss. Here is some information about extreme fad diets, including liquid diets, the grapefruit diet, and the cabbage soup diet:
Liquid Diets
Liquid diets typically involve consuming only liquids, such as soups, milk, hot cereal, juice, tea, and broth. There are two main types: clear liquid diets and full liquid diets. A clear liquid diet consists of only clear liquids, such as water, tea, and broth. This type of diet is often recommended before or after certain medical procedures when solid foods need to be avoided. A full liquid diet, on the other hand, includes all liquids or foods that will turn to liquid at room or body temperature, such as pureed foods. This type of diet is usually followed for a short period, ranging from five days to two weeks. While liquid diets can be helpful in specific medical situations, they are generally not suitable for long-term weight loss as they may not provide adequate nutrition and can be challenging to sustain.
Grapefruit Diet
The grapefruit diet is a fad diet that has been around since the 1930s. It claims that grapefruit contains enzymes that help burn fat when eaten before other foods. The classic version of this diet involves eating grapefruit or drinking grapefruit juice before or with every meal, along with high-fat, high-cholesterol foods like bacon and eggs. Some versions of the diet also drastically cut calories, sometimes as low as 800 calories per day. While some studies suggest that eating grapefruit before meals can aid in weight loss, it is likely due to the fruit's ability to help you feel full rather than any fat-burning properties. The grapefruit diet is typically followed for 10-12 days, and proponents claim it can lead to a weight loss of up to 10 pounds. However, health experts do not recommend losing weight at such a rapid pace, and the diet lacks variety, which can lead to boredom and difficulty in maintaining long-term weight loss.
Cabbage Soup Diet
The cabbage soup diet is a short-term, rapid weight-loss plan. It involves eating homemade cabbage soup for every meal for a week, along with 1-2 additional low-calorie foods like fruits and vegetables. While proponents claim it can lead to a weight loss of up to 10 pounds in a single week, health experts warn that it does not promote health and wellness, and the results are unlikely to be sustainable. The cabbage soup diet is very low in calories, which can lead to temporary weight loss. However, when you stop the diet, the weight is likely to return, and the limited food choices can make it challenging to get enough calories to maintain your weight.
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High-protein diets, e.g. Paleo, Whole 30, Carnivore
High-protein diets such as Paleo, Whole30, and Carnivore have gained popularity as fad diets. These diets emphasize the consumption of protein-rich foods, often in conjunction with the restriction of certain food groups. While they may offer short-term benefits, there are also potential downsides and health risks associated with them.
The Paleo diet, short for Paleolithic diet, is based on the presumed ancient diet of our hunter-gatherer ancestors. Proponents of this diet believe that by consuming lean animal foods, eggs, fruits, non-starchy vegetables, and unsaturated fats, one can prevent or cure modern diseases like heart disease, diabetes, and even cancer. However, this diet excludes whole grains, which have been linked to lowering the risk of these very diseases. Additionally, the strict exclusion of certain food groups may lead to unhealthy obsessive thinking about one's diet.
The Whole30 diet is a short-term, 30-day elimination and reintroduction program. It involves cutting out highly processed foods, added sugars, and certain food groups for 30 days, followed by a gradual reintroduction of these foods while monitoring for any negative symptoms. The goal is to help individuals identify potential food sensitivities and create a personalized approach to a healthy diet. While Whole30 can lead to reduced inflammation, it requires rigorous discipline and may not provide sufficient guidance on long-term dietary habits. There is also a risk of a rebound effect, with individuals prone to overeating or overindulging after the strict 30-day period.
The Carnivore diet is an extreme form of a ketogenic diet, almost entirely devoid of carbohydrates. It allows for the consumption of meat, fish, poultry, and dairy, along with the fats naturally occurring in these foods. While it can induce weight loss due to ketosis, the long-term health risks are significant. The diet is associated with increased levels of LDL ("bad") cholesterol due to the high consumption of animal-based saturated fats. Additionally, the very high protein intake can lead to impaired kidney function, and there are concerns about the increased risk of kidney stones, gout, and osteoporosis.
While these high-protein fad diets may offer short-term benefits or appeal to specific dietary preferences, it is always advisable to consult with a healthcare professional or registered dietitian before embarking on any restrictive dietary program. Balanced diets that include a variety of nutrient-rich foods from different food groups are generally recommended to ensure adequate nutrition and long-term health.
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Frequently asked questions
The Atkins diet, Ketogenic (Keto) Diet, Paleo Diet, Whole 30 Diet, Carnivore Diet, and South Beach Diet are some examples of low-carbohydrate fad diets.
Liquid diets include the grapefruit diet, which involves consuming grapefruit in large quantities, and the liquid-only diet, which involves drinking a mixture of water, lemon juice, maple syrup, and cayenne pepper for 10 days.
The Ketogenic (Keto) Diet, Paleo Diet, Whole 30 Diet, Carnivore Diet, and South Beach Diet are also high-protein diets. These diets tend to be high in fat and cholesterol and restrict fruits, vegetables, grains, and cereals.
The 5:2 diet, which involves eating normally for five days and fasting for two non-consecutive days, is a form of modified intermittent fasting. Other examples include the Body for Life program and the Cookie Diet, which uses low-fat cookies to replace meals.
The Mediterranean diet, Inuit diet, and Subway diet are examples of fad diets based on specific food combinations. The Mediterranean diet focuses on foods like olive oil, legumes, and unrefined cereals, while the Inuit diet consists mainly of locally sourced meat and fish. The Subway diet, made famous by Jared Fogle, involves consuming Subway sandwiches in place of higher-calorie fast foods.
