Dante Carrillo
The Western diet has changed drastically over the last century, and it is now characterized by a high intake of energy-dense and nutrient-poor foods such as fast food, soft drinks, and highly processed foods, which are high in added sugars, salt, and saturated fats. This has resulted in a significant increase in sugar consumption, with sugars being added to the majority of processed foods in the UK. This has contributed to an obesity epidemic, with obesity rates in the US increasing from 30.5% in 1999 to 42.4% in 2017. Obesity is a major risk factor for various chronic diseases, including type 2 diabetes, cardiovascular disease, and certain cancers. The high intake of added sugars in the Western diet has been linked to an increased risk of these diseases.
| Characteristics | Values |
|---|---|
| Dietary changes | The diet of the average Westerner has changed radically over the last century. |
| Diseases | Diseases like heart disease, diabetes, stroke, colorectal cancer, cardiovascular disease, hypertension, hyperlipidemia, sleep apnea, and certain cancers have emerged largely due to dietary changes. |
| Carbohydrates | The carbohydrate load for most Americans far surpasses that of prehistoric man. |
| Food processing | The manner in which foods are handled and processed in Western society has altered critical nutritional components and characteristics of the human diet. |
| Macronutrients | There have been multiple radical changes in the amount and type of fiber, proteins, fats, and especially carbohydrates. |
| Processed foods | Cookies, cake, bakery foods, breakfast cereals, snack foods, fast foods, packaged snacks, and sugary drinks are common in the Western diet. |
| Refined foods | White flour, white rice, and added sugars are common in the Western diet. |
| Red and processed meats | Red and processed meat consumption is associated with an increased risk of colorectal cancer, cardiovascular disease, and type 2 diabetes. |
| Saturated and trans fats | Saturated and trans fats are common in the Western diet and are linked to an increased risk of cardiovascular disease. |
| Obesity | The Western diet has been a significant contributor to the growing rate of obesity over the last few decades. |
| Chronic illnesses | Obesity increases the risk of chronic illnesses such as type 2 diabetes, cardiovascular disease, hypertension, hyperlipidemia, sleep apnea, and cancer. |
| Caloric intake | Weight gain occurs when more calories are consumed than expended. |
| Added sugars | Added sugars should constitute no more than 5% of energy intake. |
| Misleading labelling | Foods marketed as "low fat" often contain high levels of added sugar. |
| Inflammation | The Western diet is associated with an increase in inflammation-associated Proteobacteria and LPS-derived endotoxemia. |
| Gut microbiota | The Western diet is linked to a decrease in beneficial gut bacteria such as Eubacterium and Streptococcus and an increase in pathogenic bacteria such as Proteobacteria. |
| Eating addictive-like behaviors | The Western diet is characterized by highly palatable foods that can trigger eating addictive-like behaviors, including seeking and bingeing fat and sugar intake. |
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What You'll Learn
Sugar is linked to obesity, diabetes, and cardiovascular disease
The average Western diet has changed significantly over the past century, with one of the most notable changes being the dramatic increase in sugar consumption. This shift in diet has been linked to various health issues, including obesity, diabetes, and cardiovascular disease.
Obesity rates have risen in conjunction with increased sugar consumption. Research has drawn a link between sugar consumption and excess body weight, with the average American consuming 20 teaspoons of sugar daily, far exceeding the recommended intake. This contributes to weight gain and expands the nation's waistline.
Sugar is also linked to an increased risk of diabetes. While natural sugars in fruits and vegetables are not associated with diabetes, the consumption of added sugars and artificial sweeteners can lead to adverse effects on the liver and a higher risk of obesity, both of which are contributing factors to type 2 diabetes. Additionally, artificial sweeteners have been linked to insulin resistance and type 2 diabetes, possibly due to their impact on increasing cravings for sweet-tasting foods.
Furthermore, sugar consumption has implications for cardiovascular health. Studies have shown that a diet high in added sugar can increase the risk of dying from heart disease by 38%. This is often linked to other factors such as high blood pressure, high cholesterol, and diabetes, which are more prevalent in individuals with obesity. Even when accounting for these factors, obesity itself increases the risk of heart failure.
The manner in which foods are processed in Western societies has altered the nutritional components of the human diet, leading to a higher intake of carbohydrates and sugars. This rapid evolutionary change in diet is believed to be a significant contributor to the emergence of "diseases of civilization," including heart disease, diabetes, and stroke.
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Processed and refined foods are high in added sugars
The Western diet is characterised by a high intake of energy-dense and nutrient-poor foods, including fast food, soft drinks, and highly processed foods, which are major sources of added sugars. Processed foods are those that have been altered from their natural state, often to improve taste and increase shelf life. This processing can involve adding sugars, which are included for flavour, texture, or as preservatives.
Refined sugars, such as table sugar and high-fructose corn syrup, are commonly added to processed foods. These sugars have been extracted and refined from natural sources, such as sugar cane or sugar beets, and are considered empty calories due to their lack of nutritional value. They are also linked to an increased risk of health issues, including obesity, type 2 diabetes, heart disease, depression, dementia, liver disease, and certain types of cancer.
Processed foods that are high in added sugars include fast food, packaged snacks, baked goods, sugary drinks, ice cream, pastries, and soda. These foods tend to be heavily processed and can also be high in salt and added fats, which can further contribute to negative health outcomes when consumed in excess.
The high consumption of processed and refined foods in the Western diet has been linked to the increased prevalence of obesity and related diseases. In the United States, obesity rates have risen significantly in recent decades, with dietary patterns, such as the high consumption of added sugars, being a major contributing factor. The Western diet's high intake of added sugars has also been associated with an increased risk of type 2 diabetes, cardiovascular disease, and certain cancers.
It is important to note that added sugars can be hidden in unexpected places, such as condiments, sauces, dairy products, breakfast cereals, and even savoury foods like pasta sauce. Reading nutrition labels and ingredient lists can help identify foods with added sugars, as they are often listed by various names, including sugars, syrups, and ingredients ending in "-ose". Reducing the consumption of processed and refined foods that are high in added sugars and opting for whole, minimally processed alternatives can help mitigate the negative health impacts associated with the Western diet.
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Sugar is often hidden in low-fat foods
The diet of the average Westerner has changed drastically over the last century. The consumption of sugar is one of the most fundamental changes. Sugar is often added to enhance flavour, but it is also commonly added to packaged foods for texture or as a preservative to increase shelf life. The Western diet has been a significant contributor to the growing rate of obesity over the last several decades. Obesity remains a significant public health concern.
Several studies have compared the sugar content in low-fat and regular versions of the same foods. The results show that the amount of sugar is higher in low-fat and non-fat versions of tested items. This suggests that food that is lower in fat may contain more sugar. For example, a medium non-fat mocha drink has only half a gram of fat but a whopping 47 grams of sugar. That’s 73% of its total calories. Similarly, low-fat, sugar-sweetened yogurt contains too much sugar to be considered nutritious. For instance, 1 cup of fruit-flavoured, non-fat yogurt contains 31 grams of sugar.
Low-fat foods may seem healthy, but they’re often loaded with added sugar and other unhealthy ingredients. These can lead to excessive hunger, weight gain, and disease. Breakfast cereals, for example, are usually loaded with added sugar. In the ingredients section, sugar is usually listed second or third, meaning it’s present in large amounts. Other examples of low-fat foods with hidden sugar include milk and coffee creamers, granola, instant oatmeal, condiments and sauces such as ketchup, jarred pasta sauce, barbecue sauce, and salad dressings.
To avoid consuming excessive amounts of sugar, it is important to read food labels and ingredient lists. Nutrition labels will always list ingredients from the highest amount to the smallest. If sugar is at the beginning of the ingredient list, that's a good clue that the food probably has added sugars. Some common sugary ingredients to keep an eye out for include cane sugar, corn syrup, high-fructose corn syrup, rice syrup, glucose, fructose, lactose, maltose, dextrose, and sucrose.
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Sugar increases inflammation and pathogenic bacteria in the gut
The Western diet is characterised by a high intake of energy-dense and nutrient-poor foods, including fast food, soft drinks, and highly processed foods, which are high in added sugars, salt, and saturated fats. This diet has changed radically over the last century, and the rapid increase in sugar consumption is considered a fundamental change.
The Western diet is associated with an increased risk of metabolic and cardiovascular diseases, as well as chronic low-grade inflammation. This inflammation is, in part, mediated by the gut microbiota, whose composition and functionality respond to dietary changes. A high intake of sugar increases the abundance of Proteobacteria in the gut while decreasing the abundance of Bacteroidetes. This alteration in the balance of microbiota leads to increased pro-inflammatory properties and decreased capacity to regulate epithelial integrity and mucosal immunity. As a result, high sugar intake may promote metabolic endotoxemia and systemic inflammation.
Animal studies have shown that a high-sugar diet increases gut permeability, potentially due to an overgrowth of inflammation-causing bacteria. This inflammation can further alter gut mucosa and tissue integrity, increasing the permeability of the intestinal wall. Additionally, high sugar intake has been linked to changes in blood fat metabolism, increasing the risk of atherosclerosis and cardiovascular disease.
The detrimental effects of a high-sugar diet are not limited to inflammation. Observational studies have linked excess added sugar consumption to the development of several chronic diseases, including diabetes, heart disease, obesity, and cancer. Obesity, in particular, is often referred to as a low-grade inflammatory disease, and a high intake of added sugar and refined carbs has been associated with weight gain and obesity. Furthermore, a high-sugar diet can counter the anti-inflammatory effects of substances like fish oil.
To mitigate the inflammatory effects of a high-sugar diet, increasing fiber intake is recommended. Fiber feeds beneficial bacteria in the gut that help reduce inflammation throughout the body. Focusing on consuming more fiber may be more effective in reducing chronic inflammation than solely trying to reduce sugar and refined carb intake.
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Sugar is addictive and can cause long-term changes in the brain
The Western diet has changed drastically over the last century, with a notable increase in the consumption of sugar. This is due to the high intake of energy-dense and nutrient-poor foods, such as fast food, soft drinks, and highly processed foods, which are prevalent in the Western diet. These foods are often high in added sugars, salt, and saturated fats. As a result, obesity, type 2 diabetes, and cardiovascular disease have emerged as "diseases of civilization".
Sugar is indeed addictive and can cause long-term changes in the brain. Research on rats has shown that intermittent access to sugar leads to binge-like consumption, which releases dopamine in the nucleus accumbens (NAc) each time. This is similar to the effect of most substances of abuse. Consequently, there are changes in the expression or availability of dopamine receptors, as well as opioid systems in the brain. These neurochemical changes are also observed with addictive drugs, including alterations in dopamine and opioid receptor binding, enkephalin mRNA expression, and dopamine and acetylcholine release in the nucleus accumbens.
The NAc is a key component of the "reward circuit", which is associated with addictive behaviour. When a behaviour causes an excess release of dopamine, a pleasurable "high" is felt, encouraging a repetition of the behaviour. As the behaviour is repeated, the brain adjusts to release less dopamine, leading to a decreased ability to resist the substance and resulting in compulsive behaviour. This is further supported by studies on rats, which found that sugar seeking increased during abstinence, suggesting long-term changes in the neural circuitry underlying motivation.
Furthermore, sugar overconsumption leads to neurobiological brain function changes, which alter emotional states and subsequent behaviours. There is a significant overlap between the neural pathways involved in emotions that guide behavioural responses to survival situations and those regulating the overconsumption of highly palatable food. This overlap may contribute to the development of obesity, as individuals struggle to resist the urge to consume high-fat and sugary foods.
While some people believe that sugar can be consumed in moderation, others recommend avoiding it completely due to its addictive nature and potential health consequences.
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Frequently asked questions
The Western diet is characterised by a high intake of energy-dense, nutrient-poor foods such as fast food, soft drinks, and highly processed foods. It is also marked by high consumption of red and processed meats, saturated and trans fats, refined carbohydrates, and sugar.
In the UK and Europe, the guideline daily amount for sugar has not been updated since 2003, which suggests that one can consume 22 teaspoons of sugar daily. In contrast, the American Heart Association recommends that women consume less than 6 teaspoons of sugar daily and men consume less than 9 teaspoons of sugar daily.
The Western diet has been linked to an increased risk of obesity, type 2 diabetes, cardiovascular disease, and certain types of cancer. It is also associated with a higher risk of inflammatory bowel disease, asthma, and other chronic inflammatory diseases.
Unlike fat and protein, refined sugars offer no nutritional value and are a source of unnecessary calories. High intake of added sugars has been specifically linked to an increased risk of obesity, type 2 diabetes, and cardiovascular disease.
Initiatives such as Action On Sugar aim to pressure the food industry to reduce added sugar in processed foods. Individuals can also take steps to reduce their sugar intake by being aware of misleading labelling, limiting their consumption of processed foods, and following recommended dietary guidelines for sugar consumption.
