Does eating too much sugar cause diabetes? For years, scientists have said “not exactly.” The prevailing theory suggests that eating too much of any food, including sugar, can cause you to gain weight; and it’s the resulting obesity that predisposes people to diabetes. But now the results of a large new epidemiological study suggest sugar may also have a direct, independent link to diabetes.
Links between sugar consumption and both obesity and Type 2 diabetes have been recognised for years - but it has generally been assumed that diabetes is largely a consequence of obesity.
Findings from this new study suggest otherwise, as they show a direct link between sugar consumption and diabetes that is independent of obesity. Furthermore, these data support the view that 'not all calories are the same' - in that extra calories from sugar were associated with increased rates of diabetes (both across countries and over time, and controlling for obesity and other factors), while calories from other food sources were not.
Population studies like this can never actually 'prove' causation - but as with tobacco smoking and lung cancer, when randomised controlled trials are not an option, it surely makes sense to consider the totality of the evidence.
As Professor Marion Nestle (who was not involved with this study) said: "How much circumstantial evidence do you need before you take action? At this point we have enough circumstantial evidence to advise people to keep their sugar intake a lot lower than it normally is.”
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Researchers from the Stanford University School of Medicine, UC Berkeley and UC San Francisco examined data on global sugar availability and diabetes rates from 175 countries over the past decade. After accounting for obesity and a large array of other factors, the researchers found that increased sugar in a population’s food supply was linked to higher diabetes rates independent of rates of obesity. Their study was published on Feb. 27 in PLoS One.
“It was quite a surprise,” said Sanjay Basu, MD, PhD, an assistant professor of medicine at the Stanford Prevention Research Center and the study’s lead author. The study provides the first large-scale, population-based evidence for the idea that not all calories are equal from a diabetes-risk standpoint, Basu said. “We’re not diminishing the importance of obesity at all, but these data suggest that at a population level there are additional factors that contribute to diabetes risk besides obesity and total calorie intake, and that sugar appears to play a prominent role.”
Specifically, more sugar was correlated with more diabetes. For every additional 150 total calories, the prevalence of diabetes in the population rose 0.1%, but if those 150 calories were sugar (e.g. a 12-ounce can of soda), diabetes prevalence instead rose 1.1%, even after controlling for obesity, physical activity, other types of calories, and a number of economic and social variables.
Not only was sugar availability correlated to diabetes risk, but the longer a population was exposed to excess sugar, the higher its diabetes rate after controlling for obesity and other factors. In addition, diabetes rates dropped over time when sugar availability dropped, independent of changes to consumption of other calories and physical activity or obesity rates.
The findings do not prove that sugar causes diabetes, Basu emphasized, but do provide real-world support for the body of previous laboratory and experimental trials that suggest sugar affects the liver and pancreas in ways that other types of foods or obesity do not. “We really put the data through a wringer in order to test it out,” Basu said.
The study used food supply data from the United Nations Food and Agricultural Organization to estimate the availability of different foods in the 175 countries examined, as well as estimates from the International Diabetes Foundation on the prevalence of diabetes among 20- to 79-year-olds.
The researchers employed new statistical methods derived from econometrics to control for factors that could provide alternate explanations for an apparent link between sugar and diabetes, including overweight and obesity; many non-sugar components of the food supply, such as fiber, fruit, meat, cereals and oils; total calories available per day; sedentary behavior; rates of economic development; household income; urbanization of the population; tobacco and alcohol use; and percent of the population age 65 or older, since age is also associated with diabetes risk.
“Epidemiology cannot directly prove causation”, said Robert Lustig, MD, a pediatric endocrinologist at UCSF Benioff Children's Hospital and the senior author of the study. “But in medicine, we rely on the postulates of Sir Austin Bradford Hill to examine associations to infer causation, as we did with smoking. You expose the subject to an agent, you get a disease; you take the agent away, the disease gets better; you re-expose and the disease gets worse again. This study satisfies those criteria, and places sugar front and center.”
“As far as I know, this is the first paper that has had data on the relationship of sugar consumption to diabetes,” said Marion Nestle, PhD, a professor of nutrition, food studies and public health at New York University who was not involved in the study. “This has been a source of controversy forever. It’s been very, very difficult to separate sugar from the calories it provides. This work is carefully done, it’s interesting and it deserves attention.”
The fact that the paper used data obtained over time is an important strength, Basu said. “Point-in-time studies are susceptible to all kinds of reverse causality,” he said. “For instance, people who are already diabetic or obese might eat more sugars due to food cravings.”
A weakness of the paper was its use of food availability data instead of consumption data, which was necessary because no large-scale international databases exist to measure food consumption directly.
Follow-up studies are needed to examine possible links between diabetes and specific sugar sources, such as high-fructose corn syrup or sucrose, and also to evaluate the influence of specific foods, such as soft drinks or processed foods.
Another important future step, Basu said, is to conduct randomized clinical trials that could affirm a cause-and-effect connection between sugar consumption and diabetes. Although it would be unethical to feed people large amounts of sugar to try to induce diabetes, scientists could put participants of a study on a low-sugar diet to see if it reduces diabetes risk.
Basu was cautious about possible policy implications of his work, stating that more evidence is needed before enacting widespread policies to lower sugar consumption.
However, Nestle pointed out that the findings add to many other studies that suggest people should cut back on their sugar intake. “How much circumstantial evidence do you need before you take action?” she said. “At this point we have enough circumstantial evidence to advise people to keep their sugar intake a lot lower than it normally is.”