
Diet pills have had a profound impact on America, with their usage stretching back to the late 19th century. Initially driven by shifting beauty standards and the stigmatisation of obesity, Americans began seeking solutions to make weight loss easier, leading to the emergence of diet pills. These pills, often based on thyroid extract, were widely popular despite their adverse side effects, including abnormal heartbeats, increased heart rate, and even death. The 1950s and 1960s saw the rise of amphetamine-based diet pills, such as Obetrol, and the normalisation of their use, with doctors frequently prescribing them. The addictive nature of these drugs and their potential for abuse led to a War on Drugs, resulting in stricter regulations. Despite this, diet pills continued to evolve, with new formulations like Orlistat entering the market in the 21st century. The history of diet pills in America reveals a complex relationship with weight loss, reflecting societal perceptions and the pursuit of innovative solutions to treat obesity.
| Characteristics | Values |
|---|---|
| First diet pills available | Late 1800s |
| First diet pills composition | Thyroid extract |
| Perception of obesity | Opposite of being careful, prudent, diligent and hardworking |
| First diet pills brand name | Obetrol |
| Obetrol manufacturer | Obetrol Pharmaceuticals, Brooklyn, New York |
| Obetrol approval by FDA | 19 January 1960 |
| Obetrol formula | Amphetamine mixed salts and methamphetamine |
| Side effects of first diet pills | Abnormal heartbeats, increased heart rate, weakness, chest pains, high blood pressure and even death |
| Magazine exposé | Undercover reporter posing as a patient at 10 obesity clinics given more than 1,500 pills |
| US Senate investigation | Linked rainbow pills to death |
| Controlled Substance Act | Signed into law by President Nixon in 1970 |
| Amphetamine | Classified as a Schedule II controlled substance |
| New generation of synthetic drugs | Phentermine and fenfluramine |
| Latest diet pill | Orlistat, sold by prescription as Xenical and over-the-counter as Alli |
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What You'll Learn
- The perception of beauty and weight shifts, leading to the rise of diet pills
- The dangers of diet pills: adverse effects and addiction
- The role of doctors and pharmaceutical companies in marketing and prescribing diet pills
- Regulation and scrutiny of diet pills: the FDA and the Controlled Substance Act
- The evolution of diet pills: from thyroid extract to modern formulations like Orlistat

The perception of beauty and weight shifts, leading to the rise of diet pills
During the late 19th century, societal perceptions of beauty and weight began to shift, particularly among women. People started to favour a slimmer, more athletic physique. This change in beauty standards sparked a search for solutions that would make weight loss easier, and consequently, diet pills gained popularity.
The first diet pills, referred to as "fat reducers", emerged during the patent medicine era of the late 1800s. These pills were based on thyroid extract, which can boost metabolism and aid in weight loss. Despite the pills' effectiveness in reducing weight, they also came with a range of unexpected and dangerous side effects, including abnormal heartbeats, increased heart rate, weakness, chest pains, high blood pressure, and even death. Despite the significant risks, these pills remained available until the 1960s.
In the 1940s, the introduction of amphetamines energised the weight loss industry even further. Companies like the Clark & Clark Company of Camden, NJ, began mass-producing "rainbow pills", which were brightly coloured and marketed as personalised medicine. These pills combined amphetamine with other drugs like barbiturates, thyroid, and phenobarbital. However, the colourful and seemingly personalised nature of these pills masked the dangers of high doses and untested combinations, which could lead to adverse effects such as dependence, elevated blood pressure, and stimulant-induced psychosis.
The popularity of diet pills continued into the 1950s and 1960s, with drugs like Obetrol, a combination of amphetamine mixed salts and methamphetamine, being approved by the FDA and prescribed for weight loss. It was during this time that an undercover journalist named Susanna McBee exposed the magnitude of America's amphetamine use, which was fuelled in part by the desire for weight loss.
Today, the latest entrant into the diet pill market is Orlistat, which is available by prescription as Xenical and over-the-counter as Alli. Orlistat inhibits the absorption of dietary fats, promoting weight loss. However, it has also gained notoriety for its unpleasant side effects, which have been dubbed "Alli-oops".
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The dangers of diet pills: adverse effects and addiction
Diet pills have been popular in America since the late 19th century when attitudes towards weight, particularly among women, began to shift towards a slimmer, more athletic physique. The first diet pills, known as fat reducers, were based on thyroid extract, which can increase the metabolic rate. While these pills were considered an effective form of weight reduction, they carried significant risks, including abnormal heartbeats, increased heart rate, weakness, chest pains, high blood pressure, and even death. Despite the known dangers, this form of weight control remained available until the 1960s.
The history of diet pills in America is marred by adverse effects and addiction. In the 1950s and 1960s, Obetrol, a combination of amphetamine mixed salts and methamphetamine, was a popular diet pill. Amphetamines were widely prescribed, and their use was normalised during the war and fuelled by weight concerns. However, these drugs carried the risk of dependence, elevated blood pressure, and stimulant-induced psychosis.
Diet pills are often associated with disordered eating behaviours and can serve as a gateway to eating disorders. The pressure to lose weight within diet culture can lead individuals to turn to diet pills, perceiving them as a quick fix. Additionally, the regular promotion of weight loss pills on social media and their easy availability in local grocery stores and pharmacies give people the impression that they are safe, when in fact, they are not medically recommended for weight control.
The dangers of diet pills lie in their composition, which often includes a blend of stimulants, herbs, and other ingredients that can cause toxicity and serious side effects. For example, some diet pills contain DNP (2,4-dinitrophenol), which is illegal and has been linked to deaths and serious side effects, including damage to the heart and peeling skin. Even diet pills that don't contain DNP can have adverse effects on the body and are not effective for maintaining long-term health.
Furthermore, diet pills can interact with prescribed medications, leading to additional adverse side effects. The lack of regulation and widespread misinformation regarding diet pills make them dangerous, particularly for individuals with a tendency towards disordered eating behaviours. It is crucial to address the underlying issues that drive the desire for weight loss, rather than turning to potentially harmful products.
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The role of doctors and pharmaceutical companies in marketing and prescribing diet pills
The first diet pills, referred to as fat reducers, became available during the patent medicine era of the late 1800s. These pills were based on thyroid extract, which can increase the metabolic rate. Despite significant risks, including abnormal heartbeats, increased heart rate, weakness, chest pains, high blood pressure, and even death, this form of weight control continued to be available until the 1960s. During this time, the perception of beauty shifted towards a slimmer, more athletic appearance, particularly for women, driving the demand for diet pills.
In the 1950s and 1960s, Obetrol, a combination of amphetamine mixed salts and methamphetamine, was a popular diet pill in America. It was approved by the U.S. Food and Drug Administration (FDA) in 1960 for the treatment of exogenous obesity. Amphetamine gained popularity initially as a nasal decongestant and during World War II, the U.S. military supplied amphetamine tablets to troops to combat fatigue and boost morale. This normalised its recreational use after the war.
Pharmaceutical companies also employ large numbers of sales representatives who visit doctors to pitch their drugs, provide gifts, and take them out for meals. These representatives target high-prescribing physicians and use data to track and target doctors' prescribing patterns. Additionally, companies may pay physicians to use their drugs, creating a culture of gifting and influencing prescription practices.
Doctors have played a role in prescribing diet pills, sometimes with adverse effects. For example, in the 1960s, thyroid hormone was used for weight loss treatment, often in combination with diuretics, laxatives, and amphetamines. This approach eventually fell out of use due to toxicity risks. Amphetamine, once a popular diet aid, was classified as a Schedule II controlled substance in 1970, making it harder for doctors to prescribe.
In the 21st century, the diet pill market continues to proliferate, with new entries like Orlistat, available by prescription or over the counter. The influence of pharmaceutical marketing and the prescribing practices of doctors remain a significant aspect of the diet pill landscape in America.
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Regulation and scrutiny of diet pills: the FDA and the Controlled Substance Act
Diet pills have been subject to scrutiny and regulation in the United States due to safety concerns and their potential for abuse. The Food and Drug Administration (FDA) plays a key role in regulating diet pills and dietary supplements, which are ingested products that can come in the form of pills, capsules, liquids, or powders.
The FDA's regulations aim to ensure the identity, purity, quality, strength, and composition of dietary supplements. Manufacturers are responsible for ensuring that their products are safe, truthful in their labelling, and not adulterated, misbranded, or in violation of federal law. However, the FDA does not approve dietary supplements before they are marketed, and manufacturers are not required to provide evidence of safety unless introducing a new dietary ingredient.
The Dietary Supplement Health and Education Act (DSHEA) of 1994 amended the Federal Food, Drug, and Cosmetic Act (FD&C Act) to create a new regulatory framework for dietary supplements. Under DSHEA, the FDA does not have the authority to approve dietary supplements before they enter the market, and manufacturers are generally not required to provide safety evidence. However, DSHEA excludes ingredients approved as new drugs or authorized for clinical investigation.
The Controlled Substances Act (CSA) categorizes substances into five schedules based on their accepted medical use, safety, and potential for abuse and dependence. Diet pills with controlled substances can cause physical and mental dependence, impacting manufacturing, possession, and use. An example of a controlled substance in diet pills is benzphetamine (Didrex), classified as a Schedule III controlled substance with a higher risk of abuse and potential for moderate physical or high psychological dependence.
The FDA has also taken initiatives against contaminated weight loss products, as some weight loss supplements have been found to contain undeclared drugs and chemicals, such as sibutramine and fenproporex, which can have serious adverse effects. The FDA provides information and warnings to consumers and health practitioners about these contaminated weight loss products.
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The evolution of diet pills: from thyroid extract to modern formulations like Orlistat
The evolution of diet pills can be traced back to the late 19th century when the perception of beauty shifted towards a slimmer, more athletic appearance. This change in beauty standards sparked a search for solutions to make weight loss easier, and the first diet pills, known as "fat reducers", were introduced. These pills, which included brands such as "Frank J. Kellogg's Safe Fat Reducer", were based on thyroid extract, which increases metabolic rates. While these pills were considered effective for weight reduction, they also came with a range of unexpected and severe side effects, including abnormal heartbeats, increased heart rate, weakness, chest pains, high blood pressure, and even death. Despite the risks, thyroid extract pills remained available until the 1960s.
In the 1930s, a new medication called dinitrophenol became popular for weight loss due to its thermogenic effects. However, its use also led to several accidental deaths from hyperthermia, severe rashes, damage to taste buds, and eye cataracts. During the 1950s and 1960s, a popular diet pill in America was Obetrol, which combined several amphetamine salts to treat exogenous obesity.
The 1960s witnessed a resurgence in the use of thyroid hormones, often in combination with diuretics, laxatives, and amphetamines, for weight loss. However, this approach eventually fell out of favour due to concerns about toxicity. In the following decade, a Danish physician's use of ephedrine and caffeine to treat asthma was adopted for weight loss purposes. This treatment gained widespread popularity after the United States passed the Dietary Supplement Health and Education Act in 1994, classifying ephedra as an herb that did not require FDA approval. However, adverse reactions in the form of cardiovascular and neurological problems forced the FDA to later declare ephedra as unsafe.
Today, modern diet pills have evolved to prioritize safety and natural ingredients, moving away from the dangerous "fat reducers" of the past. Many modern formulations are based on herbal compositions, and one of the latest entries into the market is Orlistat, sold by prescription as Xenical and over-the-counter as Alli. Orlistat works by reducing the absorption of dietary fat in the digestive tract. It is recommended that Orlistat be taken in conjunction with a program of regular physical activity or exercise, and under the guidance of a doctor or healthcare professional. Additionally, users are advised to follow a diet program that evenly divides the daily intake of fat, carbohydrates, and protein over three main meals, while also limiting foods with high-fat content.
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Frequently asked questions
The first diet pills in America were introduced during the patent medicine era of the late 1800s. These pills, referred to as fat reducers, were based on thyroid extract, which can increase the metabolic rate.
The early diet pills had significant side effects, including abnormal heartbeats, increased heart rate, weakness, chest pains, high blood pressure, and even death. Despite these risks, they remained available until the 1960s.
During the mid-20th century, amphetamines gained popularity as diet pills. Brand names included Benzedrine, Dexedrine, and Obetrol. Obetrol, a combination of amphetamine mixed salts and methamphetamine, was approved by the FDA in 1960 for the treatment of exogenous obesity.
Modern alternatives to the early diet pills include Orlistat (Xenical/Alli), which inhibits the absorption of dietary fats. Next-generation GLP-1s, including injectable medications like semaglutide, have also entered the market in the 2020s.






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