
Diet pills and weight-loss drugs are often associated with adverse side effects. While some pills are marketed as herbal or all-natural, they may contain dangerous, unapproved, or counterfeit ingredients. In 2020, the FDA requested the withdrawal of lorcaserin (Belviq) from the US market due to an increased risk of cancer. Other diet pills have been linked to organ toxicity, decreased vitamin D levels, and interference with the effectiveness of cancer treatments. Furthermore, muscle-building supplements have been associated with an increased risk of testicular germ cell cancer in men. While diet pills may induce weight loss, they are not a substitute for behaviour change and can have serious health consequences, including cancer.
| Characteristics | Values |
|---|---|
| Cancer risk | In 2020, the FDA requested the withdrawal of lorcaserin (Belviq, Belviq XR) from the market as the risk of cancer (pancreatic, lung, and colorectal) outweighed any benefit from the drug. |
| Side effects | Diet pills can have nasty side effects and are not an effective method for maintaining a healthy weight long-term. Side effects include insomnia, increased blood pressure, fast heart rate, restlessness, drug dependence, abuse, and withdrawal symptoms, oily spotting, gas, upset stomach, and constipation. |
| Interactions | Diet pills may block the function of other drugs, including cancer treatments. |
| Organ toxicity | Diet pills have been associated with organ toxicity, including gastrointestinal issues and liver toxicity. |
| Vitamin D levels | Diet pills may decrease vitamin D levels, which is important for bone health, cell growth, and immune function. |
| Malnutrition | Diet pills can lead to malnutrition, which can be dangerous for individuals with body dysmorphia. |
| Counterfeit products | Counterfeit diet pills may contain dangerous and unapproved ingredients. |
| Muscle-building supplements | Muscle-building supplements may lead to an increased risk of testicular germ cell cancer in men. |
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What You'll Learn
- Diet pills may cause organ toxicity and gastrointestinal issues
- Weight loss drugs can cause nausea, vomiting, diarrhoea, and stomach pain
- Dietary supplements may contain dangerous, unapproved, or counterfeit ingredients
- Diet pills may block the function of other drugs, including cancer treatments
- Diet pills may decrease users' vitamin D levels

Diet pills may cause organ toxicity and gastrointestinal issues
Diet pills have been associated with a range of side effects, including gastrointestinal issues and organ toxicity. While some pills are approved by the FDA for weight loss or diabetes treatment, they can still have adverse effects on the body.
One of the most common issues with diet pills is their impact on the gastrointestinal system. For example, GLP-1 receptor agonists like liraglutide (Saxenda), semaglutide (Wegovy, Ozempic), and tirzepatide (Zepbound, Mounjaro) can cause stomach-related side effects such as nausea, vomiting, diarrhea, constipation, and stomach pain. These issues are often temporary and subside once the body adjusts to the medication. However, they can be uncomfortable and may lead some individuals to discontinue their treatment.
Diet pills can also cause organ toxicity, particularly affecting the liver. Orlistat (Alli, Xenical), a lipase inhibitor, has been linked to liver toxicity. It works by blocking the absorption of dietary fats, leading to weight loss. While it can be effective for long-term weight management, the potential for liver damage is a serious concern.
Additionally, diet pills have been known to interfere with other medications, including cancer treatments. Orlistat, for instance, limits the function of a protein called CES2, which is necessary for activating common cancer drugs like PPD. This interference can potentially reduce the effectiveness of cancer treatments, which is a significant issue for patients undergoing cancer therapy.
The side effects of diet pills can vary widely, and it's important for individuals to carefully consider their options in consultation with a healthcare professional. While these pills can aid in weight loss, they may also come with unwanted and sometimes severe side effects. It's crucial to weigh the benefits against the risks and to prioritize overall health and well-being.
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Weight loss drugs can cause nausea, vomiting, diarrhoea, and stomach pain
Weight loss drugs can have a range of side effects, and nausea, vomiting, diarrhoea, and stomach pain are among the most common. These adverse effects can be unpleasant and, in some cases, severe.
Nausea is a frequent issue for people taking weight loss drugs. For example, in a Mayo Clinic study, nausea was the most common side effect experienced by patients using semaglutide drugs for weight loss. Similarly, in a clinical trial of Wegovy, nausea was one of the most prevalent gastrointestinal issues reported by participants. Nausea can be managed to an extent by drinking electrolytes and staying hydrated, as well as adjusting one's diet and dosage.
Vomiting is another possible consequence of taking weight loss drugs. This can be violent and traumatic, as evidenced by a Louisiana woman's experience of hospitalisation due to vomiting so severe that she lost teeth. This particular case involved the drugs Ozempic and Mounjaro.
Diarrhoea is also a known side effect of weight loss drugs. It is often associated with nausea and other gastrointestinal problems. In the aforementioned Mayo Clinic study, diarrhoea was reported as a side effect by half of the 305 patients taking semaglutide drugs.
Stomach pain or abdominal pain is another adverse effect of weight loss drugs. This can range from mild discomfort to intense cramps that significantly impact one's quality of life. Courtney Blair, a business systems analyst in Vancouver, experienced such severe stomach pain from taking Ozempic that she could see her skin rippling from the intense cramps.
While these side effects are unpleasant, it is important to note that they typically subside within a few weeks, especially once a stable maintenance dose is reached. Additionally, these drugs are generally considered safe when taken as prescribed, and careful diet and medical supervision can help mitigate these adverse effects.
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Dietary supplements may contain dangerous, unapproved, or counterfeit ingredients
Additionally, muscle-building supplements may contain anabolic steroids, which can have dangerous consequences, especially for younger men, including liver injury, problems with bile secretion, testicular disorders, breast tissue growth, and infertility. Diet pills may also be associated with organ toxicity and decreased vitamin D levels. For example, the diet drug orlistat has been linked to gastrointestinal issues and liver toxicity, and it may interfere with the activation of cancer drugs.
Furthermore, DNP, an illegal component in some diet pills, can cause long-term side effects such as skin peeling and heart damage. Diet pills that are purchased online or from questionable sources may contain dangerous, unapproved, or counterfeit ingredients. It is important to be cautious when considering the use of dietary supplements and to consult with healthcare professionals to ensure their safety and effectiveness.
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Diet pills may block the function of other drugs, including cancer treatments
Diet pills have been linked to a variety of side effects, and their long-term safety is questionable. In 2020, the FDA requested the withdrawal of lorcaserin (Belviq) from the US market due to an increased risk of cancer, including pancreatic, lung, and colorectal cancer. This highlights the potential dangers of diet pills and the importance of careful consideration before use.
One of the concerns regarding diet pills is their potential interaction with other medications. Diet pills may block the function of other drugs, including cancer treatments, which can have serious consequences for patients. Research has shown that the diet drug orlistat, for example, interferes with the activation of a common cancer drug, PPD, by limiting the function of the protein CES2. This interaction may compromise the effectiveness of cancer treatment, underscoring the importance of medical guidance before taking diet pills.
Furthermore, diet pills have been associated with organ toxicity, particularly gastrointestinal issues and liver toxicity. They can also decrease vitamin D levels, which are crucial for bone health, cell growth, and immune function. The side effects of some diet pills, such as semaglutides, may even resemble those of chemotherapy, making it challenging for cancer patients to manage both treatments simultaneously. This highlights the complexity of introducing diet pills into an existing medication regimen, especially for those undergoing cancer treatment.
The potential for diet pills to interfere with other medications, including cancer treatments, underscores the necessity of seeking professional medical advice before their use. While diet pills may offer weight loss benefits, their impact on the effectiveness of other drugs cannot be overlooked. It is essential to carefully assess the risks and benefits of taking diet pills, especially for individuals with existing medical conditions or those undergoing treatment for critical illnesses like cancer.
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Diet pills may decrease users' vitamin D levels
While there is no direct evidence that diet pills cause cancer, they have been linked to an increased risk of developing the disease. Diet pills have long been associated with negative side effects, and in 2010, the FDA recalled dietary products containing the stimulant ephedra due to severe side effects such as heart attacks, strokes, and seizures. In 2020, the FDA requested that the manufacturer withdraw lorcaserin (Belviq, Belviq XR) from the market as the risk of cancer outweighed any benefits from the drug.
Diet pills have also been associated with organ toxicity, and in particular, the diet drug orlistat has been found to limit the function of a protein, CES2, necessary for activating a common cancer drug, PPD. Furthermore, diet pills may decrease users' vitamin D levels, which is concerning given that vitamin D is essential for bone health, cell growth, and immune function. Research has shown that adolescent participants' vitamin D levels decreased after one month of taking orlistat, despite also taking a multivitamin daily.
The use of muscle-building supplements has been linked to an increased risk of testicular germ cell cancer in men, with a study of nearly 1000 men finding a strong association between the use of these supplements and the development of testicular germ cancer. The American Academy of Pediatrics is strongly opposed to the use of supplements for weight loss and muscle building in adolescents, yet a national survey found that 11% of teens had used a weight-loss supplement.
It is important to note that over-the-counter dietary supplements are not reviewed or approved by the FDA, and tainted dietary supplements are frequently removed from the market due to health concerns. Consumers are advised to avoid buying questionable products, especially online, as these may contain dangerous, unapproved, or counterfeit ingredients.
While the link between diet pills and cancer is not definitive, the potential side effects and risks associated with their use are concerning. It is always advisable to consult with a healthcare professional before taking any dietary supplements or weight-loss medications to ensure they are safe and appropriate for your individual needs.
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Frequently asked questions
Diet pills have not been conclusively proven to cause cancer. However, they have been linked to several health risks, including organ toxicity, decreased vitamin D levels, and interference with other medications. In addition, the long-term use of pills containing DNP can lead to peeling skin and heart damage, and DNP pills are illegal.
In 2020, the FDA requested that the manufacturer withdraw lorcaserin (Belviq, Belviq XR) from the market due to an increased risk of cancer. The FDA has also banned 1,3-dimethylbutylamine (DMBA), a synthetic stimulant found in some supplements. Furthermore, muscle-building supplements have been linked to an increased risk of testicular germ cell cancer in men.
Diet pills can cause various side effects, including gastrointestinal issues, liver toxicity, and interference with cancer treatments. They may also cause insomnia, constipation, headaches, and dry mouth. It is important to carefully consider the potential risks and side effects before taking any diet pills and to consult a healthcare professional.











































