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1858 words
- A national anti-sugar campaign is gaining momentum. The 60 Minutes report examines emerging research from major American institutions suggesting that excessive consumption of added sugar may contribute to heart disease and other leading causes of death. The campaign is led by Dr. Robert Lustig, a California endocrinologist who considers added sugar a major public-health threat.
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- Dr. Robert Lustig identifies sugar as a major contributor to preventable disease. A pediatric endocrinologist at the University of California, San Francisco, Lustig says his concern grew from treating sick and obese children. He links excessive sugar consumption to obesity, type 2 diabetes, hypertension and heart disease. He estimates that 75% of these lifestyle-related health problems are preventable.
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- Lustig's YouTube lecture helped turn his scientific position into a mass movement. After publishing approximately a dozen scientific articles about sugar, his lecture Sugar: The Bitter Truth brought his message to a much wider audience. He describes his campaign as a war against bad food.
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- Lustig considers added sugar in processed foods a much larger problem than desserts and soft drinks alone. His list includes table sugar, honey, syrup, sugary beverages and desserts, but also processed products in which sugar is less obvious, including yogurt, sauces, bread and peanut butter. His argument is that consumers can consume substantial quantities without recognizing how much added sugar their diets contain.
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- Lustig considers high-fructose corn syrup and ordinary table sugar equally harmful. He rejects the idea that high-fructose corn syrup is uniquely dangerous, arguing that both sweeteners contain fructose and are essentially equivalent in their effects. He considers both equally toxic.
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- The decline in conventional sugar consumption has been offset by increased high-fructose corn syrup consumption. The report states that sugar consumption has fallen nearly 40% since the 1970s, but high-fructose corn syrup has more than compensated for that reduction. Consequently, the decline in one sweetener has not translated into a comparable reduction in overall exposure to added sweeteners.
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- Lustig offers an evolutionary explanation for human attraction to sweetness. He argues that humans developed a preference for fructose because naturally occurring fructose was historically encountered in fruits, which were generally safe foods. Sweetness therefore became an evolutionary signal encouraging people to consume it.
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- Whole fruit and concentrated added sugar differ in how easily people consume fructose. Lustig argues that humans historically obtained fructose in relatively small quantities through fruit, where fiber slowed absorption and helped limit consumption. He uses the example that eating ten oranges at once would be difficult, whereas concentrated sweeteners make much larger quantities easier to consume.
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- The report places American sugar consumption at approximately 130 pounds per person annually. That is equivalent to roughly one-third of a pound every day. Lustig argues that cheaper sugar production and the widespread availability of concentrated sweeteners have encouraged excessive consumption.
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- Research by nutritional biologist Kimber Stanhope provides experimental evidence linking excessive added sugar consumption to cardiovascular risk factors. Stanhope, from the University of California, Davis, is conducting a five-year study examining the effects of high-fructose corn syrup. The preliminary findings reported in the program show increases in risk factors associated with heart disease and stroke.
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- Stanhope's research uses unusually controlled dietary conditions. Participants are paid to stay in a hospital research wing for weeks at a time. Researchers monitor them continuously, conduct scans and blood tests, and weigh and prepare every calorie they consume. The arrangement is designed to prevent outside food consumption from interfering with the results.
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- The study compares participants' responses before and after introducing sweetened drinks. Participants initially consume a diet low in added sugars for several days so researchers can establish baseline blood measurements. Subsequently, 25% of their daily calories are replaced with sweetened drinks, and researchers collect blood samples every 30 minutes around the clock.
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- Stanhope detects increased LDL cholesterol and other cardiovascular risk factors within two weeks. Her findings show that participants consuming high-fructose corn syrup experienced increases in LDL cholesterol and other indicators associated with cardiovascular disease. The speed of these changes surprised her, and she says the findings prompted her to substantially reduce her own sugar consumption.
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- Lustig's explanation for sugar's cardiovascular effects centers on how the liver processes fructose. He argues that excessive fructose overloads the liver, which converts some of it into fat. Some of that fat enters the bloodstream and contributes to the production of small, dense LDL cholesterol particles associated with plaque formation and heart attacks.
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- The research challenges the conventional belief that all calories have equivalent metabolic effects. Stanhope argues that her findings demonstrate differences between calories from added sugars and calories from other foods. The report presents this as a challenge to the familiar nutritional principle that a calorie is simply a calorie.
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- The report compares sugary drinks with the fatty foods Americans were previously warned against. The interviewer suggests that the findings raise the possibility that drinking sweetened beverages could be similarly damaging to the heart as eating fatty cheeseburgers. This is presented as an interpretation of the risk-factor findings, not as the result of a direct cheeseburger-versus-soda trial.
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- The historical campaign to reduce dietary fat is presented as a possible contributor to increased sugar consumption. The report recalls a government commission's efforts in the 1970s to reduce fat consumption as a way to combat heart disease. Although Americans subsequently reduced dietary fat, the interviewer notes that heart disease, metabolic syndrome, diabetes and deaths increased.
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- Lustig argues that food manufacturers replaced some of the removed fat with added sugar. He explains that removing fat made food less appealing, so manufacturers introduced sugar to restore its taste. He believes this substitution helped create the modern health problems associated with excessive sugar consumption. The report presents his explanation but does not independently establish that sugar replacement caused the subsequent increases in disease.
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- Lustig says the cardiovascular risks associated with small, dense LDL particles are not widely understood by doctors. When asked whether most physicians know about the proposed relationship between sugar and these cholesterol particles, he answers that they do not, describing the findings as new.
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- Harvard professor Lewis Cantley identifies a possible connection between sugar consumption and cancer growth. Cantley, head of the Beth Israel Deaconess Cancer Center, argues that consuming sugar produces a spike in insulin. He says insulin can have adverse effects in different tissues and may stimulate the growth of certain cancers.
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- Insulin receptors may allow certain cancer cells to obtain additional glucose from the bloodstream. Cantley explains that nearly a third of some common cancers, including breast and colon cancers, have insulin receptors on their surfaces. When insulin binds to these receptors, it signals the tumor to take up glucose, which cancer cells can use to support their growth.
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- Cancer cells can exploit the body's normal glucose distribution system. Every cell requires glucose to survive, including muscle and fat cells. Cantley explains that certain tumors have developed the ability to draw glucose from the bloodstream through their insulin receptors, effectively competing with other tissues for the available energy supply.
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- Cantley's research team is developing drugs intended to deprive cancer cells of glucose. The objective is to interrupt the glucose supply that allows certain tumors to grow. The report acknowledges that this research has not yet produced a breakthrough.
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- Cantley recommends avoiding sugar or keeping consumption to a minimum. He says he personally rarely consumes sugar and would choose water rather than a sugary drink. He believes reducing sugar intake can reduce the chances of developing cancer, although the mechanism described in the interview is not itself proof that dietary sugar restriction prevents cancer.
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- Neuroscientist Eric Stice investigates sugar's effects on the brain's reward system. Working at the Oregon Research Institute, he uses functional MRI scanners to study how the brain responds to sweetness. He describes the brain's response as resembling the activation associated with addictive drugs, including cocaine.
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- A functional MRI demonstration shows increased activity in the brain's reward regions after tasting soda. The interviewer drinks a small amount of soda delivered through a tube while inside the scanner. The images show increased blood flow in areas associated with reward and pleasure. The segment explains this response through the release of dopamine, a chemical involved in the brain's pleasure system.
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- Stice argues that sugar is particularly effective at activating the brain's reward system. He confirms that sweetness strongly stimulates reward-related brain regions, drawing comparisons with the responses associated with drugs and alcohol. The report uses this research to explain why reducing sugar consumption can be difficult.
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- Frequent consumption of sweet foods may produce tolerance and encourage progressively greater consumption. Based on scans of hundreds of volunteers, Stice says people who frequently consume soda, ice cream and other sweet foods may develop a reduced reward response. As the pleasure response becomes blunted, they may eat more to achieve the satisfaction they originally experienced.
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- The Sugar Association is challenged to respond to the scientific concerns. The program visits Jim Simon, a member of the Sugar Association's board, at a sugarcane farm in Louisiana. The interviewer tells him that almost every scientist consulted for the report is eliminating added sugars because of concerns about their health effects.
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- Jim Simon rejects the idea that consumers will completely eliminate sweeteners. He argues that portraying sugar as a uniquely harmful food risks distracting from the broader objective of reducing total calorie consumption and exercising. His position favors moderation and overall dietary balance rather than singling out sugar for elimination.
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- Simon acknowledges that the science surrounding sugar's health effects is not completely settled. When challenged about research linking sugar to heart disease, addiction and potentially cancer, he says the scientific picture is not completely clear. His recommendation to consumers is to approach their diets in a balanced way.
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- Lustig also supports a balanced diet but defines balance as a substantial reduction in sugar. He co-authored an American Heart Association report recommending that men consume no more than 150 calories of added sugar daily and women no more than 100 calories. The report notes that these limits are below the amount of added sugar in a single can of soda.
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- Lustig wants sugar consumption addressed as a public-health crisis requiring broad intervention. He argues that individual dietary choices alone are insufficient and that significant action must be taken across society.
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- Lustig proposes treating sugar more like tobacco and alcohol. He points out that society has chosen not to eliminate tobacco and alcohol entirely but has introduced measures to limit their consumption. He believes sugar should be placed in the same category, with deliberate efforts to restrict consumption because of its potential health consequences.
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