Milly Gaines
Carbohydrates are essential food nutrients that the body turns into glucose to provide energy. While eating carbs is important, consuming too many can lead to health issues. The body breaks down complex carbs, found in fruits and vegetables, more slowly, providing a steadier source of energy. Simple carbs, found in sugary drinks and treats, digest quickly, leading to blood sugar spikes. Eating too many simple carbs can contribute to weight gain and increase the risk of diabetes, heart disease, and high cholesterol. To maintain a balanced diet, it is recommended to get 45-65% of daily calories from carbs, which is about 200-300 grams of carbs per day.
| Characteristics | Values |
|---|---|
| Carb intake recommendation | 45% to 65% of daily calorie intake for all age groups and sexes (275 grams per day for a 2,000-calorie diet) |
| Excess carb intake | May cause excess water retention, weight gain, and increased cholesterol and blood sugar levels |
| Health risks | Obesity, metabolic syndrome, type 2 diabetes, heart disease, dental issues, and depression |
| Recommended carb sources | Complex carbs like vegetables, fruits, legumes, whole grains, nuts, and seeds |
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What You'll Learn
Weight gain and obesity
Carbohydrates, commonly referred to as carbs, have long been blamed for weight gain and obesity. However, this is a misconception. Carbs themselves don't make you gain weight—excess calories do. Weight gain is often related to consuming more calories than you burn over a long period.
There are two types of carbs: simple and complex. Simple carbs, found in foods like honey, sugar, desserts, chips, and refined grains, have just two sugar molecules and are rapidly digested. Complex carbs, found in foods like grains, beans, legumes, fruits, and vegetables, have more sugar molecules and take longer to digest. They're also loaded with fiber, vitamins, minerals, and phytochemicals.
The type of carbs you choose matters for weight management. Ultra-processed foods, like chips and cookies, are easy to overeat, so the calories add up quickly. A diet high in these foods is associated with an increased risk of obesity. On the other hand, complex carbs help you feel full and satisfied, making it easier to maintain a healthy weight.
It's important to note that completely cutting carbs from your diet is not recommended. Carbohydrates are the body's primary energy source, and they provide various health benefits. Instead of focusing solely on carb restriction, it's better to stick to a well-rounded meal plan, rich in key nutrients, and practice portion control to maintain a healthy weight.
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Increased risk of diabetes
Carbohydrates are macronutrients found in certain foods and drinks. They are essential food nutrients that the body turns into glucose (blood sugar) for energy. When you eat or drink foods that contain carbohydrates, your body breaks them down into glucose, which then raises the level of glucose in your blood. As blood sugar levels rise, the pancreas releases insulin to help your cells absorb that glucose.
However, eating too many carbohydrates can increase your risk of diabetes. Firstly, it is important to distinguish between complex and simple carbohydrates. Complex carbohydrates, such as those found in fruits, vegetables, and whole grains, take longer for the body to break down and are less likely to cause spikes in blood sugar. On the other hand, simple carbohydrates are digested quickly and tend to spike blood sugar levels. Eating too many simple carbohydrates can contribute to weight gain and increase the risk of diabetes, heart disease, and high cholesterol.
The glycemic index ranks carbohydrates on a scale from 0 to 100 based on how quickly and how much they raise blood sugar levels. Foods with a high glycemic index, like white bread, are rapidly digested and cause substantial fluctuations in blood sugar. Eating many high-glycemic-index foods can lead to an increased risk of type 2 diabetes. This is because high glycaemic index foods elicit higher glycaemic and insulinaemic responses, promoting insulin resistance and type 2 diabetes through beta-cell exhaustion.
In addition, the type of carbohydrate consumed also matters. Diets with a higher content of refined carbohydrates and sugar-sweetened beverages have a higher carbohydrate-to-fibre ratio. The American Heart Association recommends that foods have a carbohydrate-to-fibre ratio of not higher than 10:1. A study of Japanese men found that a higher carbohydrate intake was linked to an increased risk of type 2 diabetes in obese individuals.
Therefore, it is important to limit the consumption of simple carbohydrates and refined carbohydrates, such as sugary drinks, sweets, and refined grains. Instead, choose complex carbohydrates that are nutrient-dense and rich in fiber, vitamins, and minerals. This includes whole, unprocessed, non-starchy vegetables like lettuce, cucumbers, broccoli, tomatoes, and green beans. By making these choices, you can help reduce your risk of developing diabetes.
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Heart disease
Consuming too many carbohydrates can increase the risk of heart disease. While carbohydrates are the body's main source of energy, it is important to be mindful of the type of carbohydrates consumed. Simple carbohydrates, such as refined grains, white flour, white rice, and added sugars, can raise triglyceride levels and increase the risk of cardiovascular disease. These refined carbohydrates are stripped of beneficial nutrients and dietary fiber during processing, and they cause a rapid increase in blood sugar levels.
On the other hand, complex carbohydrates, such as whole grains, fruits, vegetables, beans, and lentils, are rich in fiber and essential nutrients like B vitamins. They are digested more slowly, leading to a gradual increase in blood sugar levels. Including these "good carbs" in your diet can help maintain a healthy weight and reduce the risk of heart disease.
It is worth noting that the quality of carbohydrates and overall diet is more crucial than solely focusing on carbohydrate restriction. Well-planned low-carb diets that include a variety of nutritious, whole, unprocessed foods can improve heart health by increasing good cholesterol levels and decreasing blood pressure and triglyceride levels. However, an excessive intake of simple carbohydrates is particularly detrimental to heart health.
Leading cardiologist Dr. Salim Yusuf's research across 17 countries supports this notion, concluding that increased carbohydrate intake is harmful and linked to a higher risk of heart disease. His findings challenge the guidelines that recommend reducing fat intake, as they observed a link between increased fat consumption and a lower risk of heart disease.
In summary, while carbohydrates are an essential part of our diet, excessive consumption, especially of simple or refined carbohydrates, can drive heart disease risk. Adopting a balanced and nutritious diet that includes complex carbohydrates, whole grains, and unprocessed foods is key to maintaining a healthy heart.
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High cholesterol
The biggest influence on blood cholesterol levels is the mix of fats and carbohydrates in your diet. A high-carbohydrate diet can increase VLDL secretion and raise blood triglyceride levels, a phenomenon known as carbohydrate-induced hypertriglyceridemia. This can occur within just five days of high carbohydrate intake. Insulin secretion is stimulated by a high intake of carbohydrates, and excessive dietary fructose can also be an issue. This leads to the creation of large amounts of new fat, which is not stored in the liver but can be burned for energy. However, with a high-carbohydrate diet, there is often no need for the body to burn this fat for energy.
Some studies have shown that a low-carb diet may have cholesterol-lowering benefits, but it is hard to find evidence that cutting out carbs entirely is beneficial. The quality of carbohydrates is important, with fruits, vegetables, whole grains, and oats being good choices. Beans, berries, and potatoes are also recommended by dietitians as healthy sources of carbohydrates that can help lower cholesterol. The Mediterranean Diet is often suggested as a heart-healthy eating plan that can help manage cholesterol levels. This diet is centred around plant-based foods, including fruits, vegetables, whole grains, and beans.
It is important to note that dietary cholesterol is not as problematic as once believed. Studies have shown a weak relationship between the amount of cholesterol consumed and blood cholesterol levels. For example, consuming one egg a day was not associated with a higher risk of heart disease. While it is still important to limit dietary cholesterol, especially with certain conditions such as diabetes, the mix of fats and carbohydrates in the diet has a greater impact on blood cholesterol levels.
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Dental issues
Consuming too many carbohydrates can lead to several dental issues, including tooth decay, cavities, and even missing teeth.
Dental caries, commonly known as tooth decay, occurs when the demineralization of tooth enamel exceeds its remineralization capacity. This process is facilitated by cariogenic bacteria, primarily Streptococcus mutans, which metabolize dietary sugars and fermentable carbohydrates to produce enamel-eroding acids. The frequency and amount of carbohydrate consumption directly impact the progression of dental caries. Simple sugars, such as sucrose, glucose, and fructose, are particularly cariogenic and readily broken down in the mouth, providing a readily available energy source for acid-producing bacteria. These acids weaken the tooth enamel, leading to cavities and tooth decay.
Additionally, starchy carbohydrates, such as white bread, instant mashed potatoes, and certain types of rice, can also contribute to dental issues. While traditionally overlooked in dental health advice, these starchy foods can cause significant drops in plaque pH, creating an acidic environment conducive to enamel degradation. The glycemic index (GI) of starchy foods plays a role, with higher GI foods leading to more substantial plaque pH decreases and potentially increasing the risk of dental caries.
Plaque buildup, a sticky film of bacteria on teeth, can also be influenced by carbohydrate consumption. If left untreated, plaque can lead to gingivitis, an inflammation of the gums that may progress to periodontal disease. This ongoing inflammation can strain the immune system and potentially impact overall health and exercise performance.
Furthermore, the breakdown of carbohydrates into simple sugars can result in sticky residues that cling to the enamel and hide between teeth, providing an extended food source for bacteria. This prolongs the exposure of enamel to erosive acids.
While carbohydrates are essential for energy, a diet rich in unprocessed, complex carbohydrates, such as whole grains, legumes, and vegetables, is recommended for maintaining dental health. These complex carbohydrates provide essential vitamins, minerals, and fibers, contributing to overall health and dental resilience. Restricting carbohydrates excessively, however, can lead to halitosis (bad breath) due to the production of ketones during the breakdown of stored fats for energy.
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Frequently asked questions
Carbohydrates are a type of macronutrient found in certain foods and drinks. They are a key part of a healthy diet and our bodies use them to make glucose (blood sugar) for energy.
A food's chemical structure and how quickly your body digests it determines whether a carb is complex or simple. Complex carbs take longer to digest and are found in fruits, vegetables, whole grains, nuts and seeds. Simple carbs are found in foods like cookies, cakes and sugary drinks and digest quickly.
Eating too many simple carbs can cause blood sugar spikes, weight gain and increase your risk of diabetes, heart disease and high cholesterol.
Complex carbs provide steady energy and are more likely to keep you full and satisfied for longer. They also contain vitamins, minerals and fibre that your body needs.
Carb needs vary depending on factors like medical history, activity level and health goals. If you're not very active or are exceeding the recommended amount of daily carbs, you could be consuming too many.
