Sugars, obesity, and cardiovascular disease: results from recent randomized control trials


The relationship between sugar consumption and various health-related sequelas is controversial. Some investigators have argued that excessive sugar consumption is associated with increased risk of obesity, coronary heart disease, diabetes (T2D), metabolic syndrome, non-alcoholic fatty liver disease, and stimulation of reward pathways in the brain potentially causing excessive caloric consumption. These concerns have influenced organizations such as the World Health Organization, the Scientific Advisory Committee on Nutrition in England not to exceed 5 % of total energy and the Dietary Guidelines for Americans Advisory Committee 2015 to recommend upper limits of sugar consumption not to exceed 10 % of calories. Data from many randomized control trials (RCTs) do not support linkages between sugar consumption at normal levels within the human diet and various adverse metabolic and health-related effects. Fructose and glucose are typically consumed together in roughly equal proportions from high-fructose corn syrup (also known as isoglucose in Europe) or sucrose. The purpose of this review is to present data from recent RCTs and findings from recent systematic reviews and meta-analyses related to sugar consumption and its putative health effects. This review evaluates findings from recent randomized controlled trials, systematic reviews and meta-analyses into the relationship of sugar consumption and a range of health-related issues including energy-regulating hormones, obesity, cardiovascular disease, diabetes, and accumulation of liver fat and neurologic responses. Data from these sources do not support linkages between sugar consumption at normal levels within the human diet and various adverse metabolic and health-related effects.

The world is in the midst of twin epidemics of obesity and diabetes often lumped together as diabesity (T2D) [16]. It has been estimated that there are over one billion individuals worldwide who are currently obese [1]. This number is anticipated to rise to 1.5 billion individuals by the year 2030 if current trends continue [1]. In the USA, it has been estimated that 33.8 % of adults, over 66 million individuals, are obese, while an additional 74 million are overweight [7]. The prevalence of obesity grew a shocking 40 % over the last 30 years [8]. The obesity epidemic is truly global. In European countries, obesity ranges from 20 to 30 % and is even higher in Australia, South America, Middle-East, and Polynesia [1].

The International Diabetes Federation estimates that there are over 300 million individuals currently living with diabetes [5]. This number is predicted to double by the year 2035 [6, 7]. Heart disease remains the leading cause of mortality worldwide and accounts for over 37 % of all mortality in the USA on an annual basis [9]. Non-alcoholic fatty liver disease (NAFLD) now represents the leading cause of liver failure and the need for liver transplantation worldwide [10, 11]. Multiple studies have now showed that these metabolic conditions are inter-related.

With these grim statistics in mind, it is not surprising that investigators have looked at various aspects of nutrition to delineate potential underlying associations and causes and recommend possible ways of ameliorating these inter-related metabolic conditions. Recent attention has been focused on the consumption of sugars, in general, and fructose containing sugars in particular [12, 13]. Some epidemiologic studies have linked consumption of added sugars to increased risk of weight gain and obesity [1416], increased risk factors for cardiovascular disease (CVD) [17] including hypertension [1820] and dyslipidemia [21, 22], and increased risk factors for diabetes [2325].

Potential linkages between added sugars and various diseases have not only public health implications, but also impact on public policy. The World Health Organization (WHO) has issued guidelines recommending that added sugars should constitute no more than 5 % of overall calorie consumption [26]. The Scientific Advisory Committee on Nutrition in England (SACN) [27] has also recommended an upper limit not to exceed 5 %, while the 2015 Dietary Guidelines Advisory Committee (2015 DGAC) in the USA has recommended an upper limit not to exceed 10 % of calories [28]. The Food and Drug Administration in the USA has followed the lead of the 2015 DGAC and recommended an upper limit of no more than 10 % of calories from added sugars [29]. In contrast, the European Food Safety Authority (EFSA) [30] found no harm in fructose consumption up to 25 % of total calories which is also consistent with the Institute of Medicine (IOM) carbohydrate report which found no harm in fructose containing sugars up to 25 % of calories [31].

In this contentious and controversial debate, it is important that members of the scientific community have to stand on firm ground and base opinions on the best available science. The purpose of the current review is to provide evidence from recent randomized controlled trials conducted in our research laboratory and others as well as findings from recent systematic reviews and meta-analyses related to sugar consumption and its putative health effects. We conclude that high quality evidence does not support a unique link between added sugars and various adverse health effects when consumed at normal levels, particularly in isocaloric settings.

Theoretical concerns

It has been known for many years that fructose and glucose are handled differently in the human body. Ninety percent of fructose is metabolized in the liver on first pass [32]. In contrast, glucose can be metabolized in multiple cells throughout the human body. Both fructose and glucose are transported into hepatocytes utilizing the facilitator glucose transporter GLUT2. Once inside the hepatic cells, however, the pathways for metabolism for fructose and glucose are considerably different.

First, fructose does not increase glycemia in contrast to glucose and, hence, does not stimulate insulin release. Fructose is phosphorylated into fructose-1-phosphate with phosphate donated by ATP which is metabolized into ADP and ultimately to AMP and finally to uric acid. The accumulation of uric acid has been argued to play a role in the development of high blood pressure [33]. This will be discussed in more detail in subsequent sections of this review. Fructose is phosphorylated by the enzyme fructokinase and subsequently cleaved into the triokinase phosphorylates glyceraldehyde to glyceraldehyde phosphate. It is important to note that at the level of glyceraldehyde phosphate, the metabolism of fructose and glucose metabolism is interactive [32]. Fructose cannot be utilized for cells in the body, and thus, there are pathways to convert it into glucose and other metabolizable molecules. Over half of fructose is converted to glucose, another 15 % to glycogen, 15–20 % to lactate, and a few percent to carbon dioxide [32]. This has been demonstrated in multiple tracer studies as summarized by Sun and Empie [34]. A small percentage of ingested fructose can ultimately be converted into free fatty acids which are ultimately packaged into triglycerides (TG) and carried into the blood stream complexed with very low-density lipoprotein (VLDL). The amount of fatty acids that are produced through this mechanism called de novo lipogenesis has been estimated in elegant studies by Hellerstein et al. [35] to be on the order of 1–5 % of ingested fructose even under settings of extreme overfeeding. The amount of fat produced though this process is in the order of one gram per day compared to the 100–125 g typically consumed each day in the human diet. Nonetheless, some investigators have argued that de novo lipogenesis is an important pathway leading from fructose consumption to fatty liver and insulin resistance.

Energy-regulating hormones

The differences in metabolism between fructose and glucose in humans have led a number of investigators to explore the impact of these two monosaccharides on energy-regulating hormones including insulin, leptin, and ghrelin [36, 37]. Teff et al. [36] reported that consuming either fructose sweetened beverages or glucose sweetened beverages at the level of 25 % of calories was resulted in lowering of 24 h concentrations of circulating insulin, glucose, and leptin and decreased postprandial suppression of plasma ghrelin concentrations. Other investigators have utilized a similar model in overweight or obese subjects and demonstrated that fructose sweetened beverages, when compared to glucose sweetened beverages, when consumed at 25 % of energy, were resulted in increased postprandial triglyceride concentrations in overweight/obese subjects compared to normal weight subjects [37]. These effects were more pronounced in men than women. It should be noted that in this model, the sugars are given as monosaccharides—namely, either glucose or fructose— despite the fact that neither of these monosaccharides is consumed in isolation to any appreciable degree in the human diet. This has created confusion since a number of scientists have speculated that these observed differences in energy-regulating hormones could create an environment resulting in increased hunger, food consumption, and obesity when consuming fructose [38, 39].

The differences between fructose and glucose effects on energy-regulating hormones have also led to further speculation that high-fructose corn syrup (HFCS) might be more obesogenic than sucrose. This speculation was based on the misperception that HFCS contains considerable higher amounts of fructose when compared to sucrose. The proper comparison, however, is HFCS (isoglucose) versus sucrose since both contain approximately 50 % of fructose and 50 % of glucose. (HFCS-55, which is the most commonly utilized form of HFCS in beverages, contains 55 % of fructose, while HFCS-42, which is the most commonly utilized form of HFCS in baked goods and other applications, contains 42 % fructose [40]. The rest of both of these forms of HFCS is glucose or glucose polymers).

Our research laboratory has conducted four trials looking at the effects of either HFCS vs sucrose or HFCS vs sucrose, glucose or fructose on energy-regulating hormones. In the trial published by Melanson et al. [41], we demonstrated that there we no different acute impacts (24 h) when comparing 25 % of calories either from HFCS or sucrose on insulin, glucose, leptin, or ghrelin in non-smoking women 20–60 years of age with body mass indexes of 19–25 kg/m2. Subsequent research trials in our laboratory evaluated energy-regulating hormones in obese individuals and found no differences between HFCS and sucrose [42].

A third study in our laboratory showed that there were no differences when comparing 8 % of calories from either HFCS or sucrose (25th percentile population consumption level) to 18 % of calories from these two sugars (50th population level in the United States) and 30 % of calories from these two sugars (90th percentile population consumption level) over a 10 week period [43]. We have subsequently shown that there are no differences in energy-regulating hormone responses when comparing average levels of consumption of fructose (9 % of calories to glucose, 9 % of calories from glucose, 18 % of calories from HFCS or sucrose), (unpublished data). Thus, assertions that metabolic differences between fructose and glucose can lead to an environment that promotes weight gain and obesity must be treated with extreme caution particularly when these two monosaccharides are evaluated at levels far beyond the normal human consumption level and in isolation in contrast to how they are normally consumed in the human diet which is invariably together.

Sugars and obesity

The modern concern about a potential role of sugars as a unique cause for obesity seems to have originated with a review article published in the American Journal of Clinical Nutrition in 2004 by Bray, Nielsen and Popkin [39]. This article raised the provocative question of whether there was a unique relationship between HFCS consumption and the rapid increase in the obesity epidemic in the USA. These researchers noted a temporal relationship between increasing consumption of HFCS and obesity and argued that the metabolism of fructose could result in increased likelihood of overconsumption of calories leading to obesity and associated metabolic diseases including CVD, T2D, and metabolic syndrome (MetS).

Multiple subsequent studies from research laboratories have not demonstrated any unique properties of HFCS compared to sucrose with regard to energy-regulating hormones, appetite or weight gain both in normal weight and obese individuals [41, 4345]. Both the Academy of the Nutrition and Dietetics [46] and the American Medical Association [47] have issued statements concluding that there are no differences between HFCS and sucrose with regard to the likelihood of causing obesity.

The literature related to sugars and obesity has subsequently shifted to a consideration of whether any fructose containing sugars such as sucrose, HFCS, or concentrated fruit juices may contribute to obesity. Several meta-analyses have suggested that sugar sweetened soft drinks (SSBs) are associated with weight gain and obesity in both children and adults [14, 15]. There have been three recent systematic reviews and meta-analyses of RCTs on sugar consumption or SSB consumption and body weight [4850]. These trials have suggested that increasing energy consumption by increasing sugar intake in adults may lead to modest weight gain; however, the weight gain appears to be due to the increased energy consumption rather than any unique aspect of sugars per se.

The systematic review and meta-analysis by Te Morenga et al. [49] included 30 randomized controlled trials (19 of which were ad libitum and 11 were isoenergetic) and 38 prospective cohort studies. The “ad libitum” randomized controlled trials and cohort studies agreed with each other that when individuals either reduced or increased sugar consumption a “small but significant” effect on body weight occurred. On average, individuals in the ad libitum trials and cohorts studies lost 0.8 kg and when they reduced their sugar intake, and gained an average of 0.75 kg when they increased their sugar consumption. The 11 isocaloric trials, however, showed no association between body weight change and sugar intake. This caused these investigators to conclude “the most obvious mechanism by which increased sugars might promote weight gain is by increasing energy consumption to an extent that exceeds energy output and restores energy balance… we observed that isoenergetic replacement of dietary sugars with other macronutrients resulted in no change in weight. This finding strongly suggested that energy balance is a major determinant of the potential for dietary sugars to influence measures of body fatness… the data suggests that the change in body fatness that occurs from modifying intake of sugars results from in alteration in energy balance rather than physiologic or metabolic consequence of monosaccharides or disaccharides.” [49].

It should also be noted that between 1970 and 2010 in the USA average total energy intake increased by 474 calories per person [51]. Virtually all of this increase in energy intake (approximately 94 %) can be attributed to an increase in flour and cereal products and added fats, while added sugars only contributed 7 % of the total increased caloric intake. Thus, data related to added sugar intake as a potential significant contributor to weight gain and obesity must be treated with great caution. Moreover, public policy attempts to limit sugar consumption as a mechanism for helping individuals control weight seem unlikely to succeed.

Sugars and cardiovascular disease

There are, to our knowledge and for obvious reasons, no reported RCTs examining the effect of sugar consumption on CHD itself. Three prospective cohort studies have examined the association between SSB consumption and incident of CHD [5254]. Eshak et al. [52] reported a large prospective cohort study and found no association between SSB consumption and myocardial infarction. de Koning et al. [53] reported data from the Male Health Professional Follow-up Study and found a significant association between CHD events and the highest quintile of SSB consumption compared to the lowest. Fung et al. [54] reported data from the Nurses’ Health Study and found significant elevated risks associated with CHD comparing greater than or equal to two servings of SSB per day compared to <1 serving per month. Te Morenga and colleagues reported a systematic review and meta-analysis of 12 trials most of which had high levels of sugar consumption—typically >95th percentile population consumption [55]. These investigators reported no increase in systolic blood pressure and a small increase in diastolic blood pressure although the absolute value of increase was low (1.4 mmHg).

Most RCTs exploring sugars and CHD have focused on risk factors for CHD rather than CHD itself.

Blood pressure

Several RCTs have examined whether fructose itself or fructose containing sugars contribute to increased blood pressure. Brown et al. [56] administered 15 subjects an acute load of fructose (60 g in 500 mL of water), glucose, or pure water and found a significant increase (approximately 3 mmHg) over the 120 min of the study following fructose consumption compared with either glucose or water. Raben et al. [57] randomly assigned 21 overweight individuals to supplements of either sucrose or artificial sweeteners for 10 weeks. Blood pressure increased more in the sucrose group than the group consuming artificial sweeteners. These data, however, are confounded by the fact that these individuals also gained on an average 2.6 kg more than controls.

Other studies have not found increases in blood pressure related to fructose administration. These include studies by Le et al. [58], Maersk et al. [59], and studies from our research laboratory at levels up to the 90th percentile population consumption level of fructose which have not shown increases in blood pressure [6062]. Moreover, Ha et al. [63] performed a meta-analysis of 13 randomized and non-randomized controlled feeding trials where subjects were given an isocaloric exchange of fructose for carbohydrates and found no increases in blood pressure.


A number of studies have explored the potential linkage between consumption of added sugars and dyslipidemia [55, 64, 65]. As a result of these studies, the American Heart Association recommended restricting consumption of fructose containing sugars as a mechanism for controlling triglycerides (TGs) [66]. Data to support this, however, are inconclusive [6769]. In isocaloric trials, even large doses of fructose containing sugars have been reported to not show lipid abnormalities [70]. In hypercaloric trials, however, in which fructose was supplemented to background diets thereby creating excess energy, increases in LDL cholesterol and triglycerides have been reported [6769]. In RCTs in our laboratory individuals who consumed either sucrose or HFCS at 10 or 20 % of calories in an isocaloric diet over 10 weeks in a free living trial, no increases in total cholesterol, TGs, or LDL cholesterol [71] occurred. In a mildly hypercaloric trial, however, a 10 % increase in TGs occurred driven largely by individuals who consumed 30 % of those calories from either HFCS or sucrose [60, 61].

Despite the conflicting data in this area, the American Heart Association has issued guidelines recommending that males consume no more than 150 kcals each day of added sugars and females no more than 100 kcals [72]. (These recommendations limit sugars to 5–7 % of total calories). The 2015 DGAC [28] recommended the upper limit of calories from added sugars to not exceed 10 % citing evidence for increased risk of cardiovascular disease associated with added sugar consumption as “moderate.” Given the mixed nature of RCTs and meta-analyses in this area, however, it appears that these recommendations should be taken with considerable caution.

Sugars and diabetes

To our knowledge, there are no RCTs examining the effect of sugars on diabetes. Therefore, studies that have been relied upon to suggest a linkage between sugars and diabetes are either lower forms of evidence, (e.g., epidemiologic and ecological studies) or studies which explore risk factors for diabetes.

Several recent ecological analyses have reported that the prevalence of diabetes is correlated with sugar consumption in various countries [24, 25]. Ecological analyses, however, are considered to be a weak form of evidence. Furthermore, as pointed out by Van Buul et al. [73] in one of these studies, in European countries, the authors confused sugar consumption with sugar production. In European Union countries, commodities such as sugar flow freely across borders thus production is very different from consumption. Furthermore, other ecologic analyses have shown markedly different results. For example, in Australia, a 10 % decrease in the contribution of sugar in beverages has recently occurred despite increases in obesity and diabetes [74]. This has been labeled the “Australian Paradox.” Similar “paradoxes” have been seen in the USA [75] and Canada where a 15 % sugar consumption decline has occurred over the past decade, while both obesity and diabetes have increased.

Prospective cohort studies provide mixed evidence concerning sugar consumption and diabetes [16, 76]. Malik et al. [16] reported a meta-analysis of cohort studies related to SSBs and incident diabetes. Of the eight studies these investigators reported, four did not find a significant effect of SSBs on the incidence of diabetes and five did not adjust findings for energy intake and body weight. Moreover, another study published by the same group did not show a relationship between sugar consumption and diabetes risk [76]. A study reported from the US Professionals Health Study Follow-Up cohort showed no association between SSB consumption and diabetes once data were adjusted for total energy intake [77].

Meta-analyses also have generated few data to support an association between sugar intake and diabetes [7880]. Cozma et al. [81] reported a systematic review and meta-analysis of RCTs and non-randomized controlled trials of fructose and diabetes and reported no adverse impact on glycemic control. Most randomized controlled studies in non-diabetic patients where sucrose or fructose have been substituted in a control diet have not shown adverse effects of multiple risk factors for diabetes [8286].

Insulin resistance is an established risk factor with diabetes often preceding T2D by 10–20 years [87]. A recent research trial reported by our laboratory compared three fructose containing sugars (fructose itself, HFCS and sucrose), to glucose and unsweetened controls at average consumption levels for fructose [88]. This study demonstrated that added sugar consumed at median American intake levels did not produce changes in measures of insulin sensitivity or glucose tolerance and that no sugar had more deleterious effects than others.

Another RCT from our research group looked at total body insulin sensitivity and hepatic insulin sensitivity using the Matsuda Index and found no increases in either variable after 10 weeks of consumption of average amounts of fructose containing sugars compared to glucose [89]. A report by Johnston et al. [90] showed that overweight men with increased abdominal girth had no increase in either hepatic or total body insulin resistance when studied in a weight stable environment. Nor were there any differences between fructose and glucose when delivered at 25 % of calories. In a second portion of this study, where these same individuals were overfed and gained weight, increases in liver fat occurred. There were, however, no differences between fructose and glucose with regard to this parameter.

Thus, when the totality of high quality evidence is taken into account, there is little support for a relationship between sugar consumption and diabetes. In hypercaloric trials, however, there does seem to be some signal for harm—more likely due to added calories rather than some unique property of sugar per se.

Sugar and liver fat accumulation

As already indicated, NAFLD has been steadily increasing worldwide over the past 20 years and represents the leading cause of chronic liver failure and the need for liver transplantation [10, 11].

It has been argued that fructose containing sugars may contribute to NAFLD though the process of de novo lipogenesis [33]. However, as already discussed, the amount of fatty acids generated through the metabolism of fructose is relatively small—on the order of 1—5 % of fructose consumed and approximately 1 % in quantity when compared to ingested fats [34, 35].

Several investigators have suggested that large doses of fructose may contribute to ectopic fat deposition in the liver [37, 38, 9193]. Stanhope et al. [37] reported that individuals who were given 25 % of their caloric intake as fructose, showed increased liver fat after fructose consumption. Le et al. [94] gave descendants of diabetics 3.5 g/kg lean body weight of fructose and found some increased accumulation of liver fat. It should be pointed out that both of these studies used dosages far in excess of normal amounts of consumption of fructose and both used fructose by itself which is normally not consumed in isolation in the human diet. Maersk et al. [66] reported increases in liver fat in individuals who consumed a one liter serving of sugar sweetened beverage compared to diet beverage, milk, and water over a 6 month period. These findings, however, were confounded by weight gain in the cohort.

Other investigators have not found increases in liver fat in short-term studies utilizing either fructose or sucrose. A RCT from our research laboratory which compared either 8, 18, or 30 % of calories from HFCS or sucrose did not find any accumulation in liver fat over a 10 week, free living trial [95]. Thus, there seems to be little evidence for a unique effect of fructose containing sugars leading to NAFLD in typical amounts and ways normally consumed by humans.

Sugars and neurologic responses

Some animal experiments have suggested differences in brain responses to fructose compared to glucose [96, 97]. However, these experiments must be treated with great caution since animal brains (particularly rodents, which were utilizing many of these studies) differ in numerous significant ways from the human brain.

Recent studies in humans have utilized functional MRI (fMRI) to look at potential different neurologic responses to various sugars in human beings [98100]. Page et al. [99] compared a 75 g oral bolus of fructose to 75 g oral bolus of glucose in 20 young, healthy volunteers and reported differences in hypothalamic blood flow with glucose suppressing this blood flow and fructose not suppressing blood flow when assessed by arterial spin labeling. Purnell et al. [100] explored neurologic responses to 25 g of either fructose or glucose delivered as intravenous boluses. Blood flow to hypothalamus was not different between fructose and glucose but there were reported differences in blood flow to the cerebral cortex. Both of these studies should be viewed with considerable caution since both utilized monosaccharides rarely consumed in isolation in human beings and, in the instance of Purnell et al., utilized an atypical delivery route (intravenous). Unfortunately, these preliminary experiments have lead some scientists to speculate that fructose containing sugars may lead to a form of “addiction” although the scientific basis such speculation remains very much in doubt [101103]. A study conducted in our research laboratory examined HFCS or sucrose given at 18 % of calories compared to 9 % of fructose or glucose in low-fat milk compared to unsweetened milk in the context of mixed nutrient meals and showed no differences in hypothalamic blood flow [104].

Summary and conclusions

Multiple RCTs, as well as recent systematic reviews meta-analyses, have suggested that when sugars are substituted isocalorically for other carbohydrates and consumed in the normal range of human consumption there is nothing unique in regard to sugar consumption and health consequences. Questions remain from research trials where fructose containing sugars have been substituted in ad libitum or hypercaloric research designs. Further studies will be necessary to settle issues in this area.

For now, we believe it is safe to state that the current literature provides little support for a unique relationship between consumption of fructose containing sugars, risk factors, cardiovascular disease, diabetes, or NAFLD at normally consumed amounts in the normal ways that added sugars are typically consumed in the human diet (e.g., sucrose or HFCS). It is important to point out that, however, abundant evidence exists suggesting that consumption of all energy dense nutrients, including added sugar, represents an important step along with decreased physical activity in increasing the risk of interrelated metabolic diseases such as obesity, CHD, T2D, and NAFLD.


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Correspondence to James M. Rippe.

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J. M. Rippe’s research laboratory has received unrestricted grants and Dr. Rippe has received consulting fees from ConAgra Foods, Kraft Foods, the Florida Department of Citrus, PepsiCo International, Coca Cola, the Corn Refiners Association, Weight Watchers International and various publishers. TJA declares no competing interests.

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Rippe, J.M., Angelopoulos, T.J. Sugars, obesity, and cardiovascular disease: results from recent randomized control trials. Eur J Nutr 55, 45–53 (2016).

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  • Sugars
  • High-fructose corn syrup
  • Sucrose
  • Obesity
  • Cardiovascular disease