Arielle Cruz
Alcohol has a significant impact on nutrition and food absorption. Alcoholic drinks represent 'empty calories', being high in kilojoules but devoid of nutritional value. The body prioritises metabolising alcohol over other nutrients, which can lead to nutritional deficiencies, particularly in amino acids, proteins, and certain vitamins. Alcohol can also cause damage to the organs involved in digestion, absorption, and nutrient processing, such as the liver, where toxic byproducts of alcohol breakdown can contribute to liver cell damage.
| Characteristics | Values |
|---|---|
| Nutritional impact | Alcoholic drinks represent 'empty calories', high in kilojoules but devoid of nutritional benefit. |
| Alcohol can cause weight gain and obesity, increasing the risk of related health issues. | |
| Alcohol can interfere with the absorption and metabolism of nutrients, leading to potential deficiencies, especially in chronic drinkers. | |
| Alcohol can cause liver damage, including alcoholic hepatitis and cirrhosis, with high mortality rates. | |
| Nutritional management approaches can help prevent or improve alcoholic liver disease. | |
| Alcohol can alter the intake, absorption, and utilization of nutrients, impacting overall nutritional status. |
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What You'll Learn
Alcoholic drinks are 'empty calories'
Alcoholic drinks are often referred to as "empty calories" because they have no nutritional value and are consumed in addition to the calories the body needs. Alcoholic beverages primarily consist of water, pure alcohol (ethanol), and variable amounts of sugars and carbohydrates. While the body can store many nutrients, protein, carbohydrates, and fat, it needs to prioritise getting rid of alcohol, which is toxic. This process interrupts other essential functions, such as absorbing nutrients and processing fat.
The metabolism of alcohol is a complex, multi-stage process that mostly occurs in the liver and kidneys, not the intestines, where normal digestion takes place. Alcohol is almost never fully metabolised and is instead excreted as acetic acid, as the body aims to eliminate it. When we binge drink, some of the alcohol is permanently deposited in the brain and stored as acetaldehyde.
Furthermore, alcohol temporarily prevents the body from burning fat. Unlike food calories, the body cannot store calories from alcohol for later use. As a result, alcohol consumption increases the likelihood of becoming overweight or obese, contributing to the risk of developing type 2 diabetes.
The NIAAA reports that "even if nutrients are digested and absorbed, alcohol can prevent them from being fully utilised by altering their transport, storage, and excretion." This disruption in the body's processes can lead to a malnutrition phase in the addiction cycle. It is important to note that drinking alcohol can also affect the hormones that control appetite, leading to an increase in junk food consumption.
While some low-alcohol and alcohol-free drinks are lower in calories due to their reduced alcohol content, it is not always the case. Different drinks have varying sugar and ingredient levels, so checking the label is essential for choosing a low-calorie option.
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Alcohol can cause weight gain
Alcohol consumption can lead to weight gain through various mechanisms. Firstly, alcohol is high in kilojoules or calories, with about 7 calories per gram, which is almost as calorie-dense as fat. These are often referred to as ''empty calories'' because they provide energy without any nutritional value. This high caloric content can contribute to weight gain, especially when consumed in excess.
Secondly, alcohol interferes with the body's ability to burn fat. Normally, the liver breaks down and processes nutrients like fat, carbohydrates, and protein, converting them into energy. However, because the body cannot store alcohol, it prioritises metabolising alcohol over these other nutrients. This disruption slows down the body's metabolic rate and reduces its ability to burn fat efficiently, leading to potential weight gain.
Thirdly, alcohol stimulates the part of the brain that triggers hunger and cravings. It increases appetite and reduces inhibitions, making individuals more likely to overeat or choose unhealthy, calorie-dense foods. This combination of increased hunger and lowered restraint can result in excess calorie consumption, contributing to weight gain.
Additionally, alcohol can lead to cravings for salty and greasy foods, further increasing the risk of weight gain. The specific mechanisms are not fully understood, but studies have shown a link between alcohol intake and the consumption of these types of foods.
While the relationship between alcohol consumption and obesity is complex and subject to individual factors, it is clear that alcohol can contribute to weight gain through these multiple pathways. Excessive drinking also carries other serious health risks, including high blood pressure, high triglycerides, heart disease, stroke, and liver disease, and an increased risk of certain cancers. Therefore, it is important to monitor alcohol intake as part of a balanced and healthy lifestyle.
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Alcohol damages organs involved in digestion
Alcohol can damage organs involved in digestion, including the liver, pancreas, gallbladder, stomach, and intestines.
The liver breaks down more than 90% of alcohol, which is then removed from the body. However, when the liver breaks down alcohol, it is converted to acetaldehyde, a highly toxic chemical and Group 1 carcinogen. The more the liver cells try to repair the damage, the more likely they are to make mistakes in their DNA, which can lead to cancer. Alcohol dependency can also cause inflammation of the liver (alcoholic hepatitis) and, over time, liver scarring (cirrhosis). While early-stage liver disease and scarring are reversible if a person stops drinking, cirrhosis is generally not.
The pancreas makes enzymes for digestion and the hormone insulin, which helps the body turn food into energy. Alcohol can damage the pancreas, causing inflammation (pancreatitis) and scarring. It can also cause the pancreas to produce toxic substances that interfere with its functions.
Alcohol can irritate and damage cells in the stomach lining, causing inflammation and increasing the risk of stomach cancer. It can also impact stomach acid production and reduce the stomach's ability to destroy bacteria, allowing potentially harmful bacteria to enter the upper small intestine.
Drinking alcohol can also affect the intestines. It can impede the muscles around the small intestines, interfering with intestinal motility. It can also cause inflammation of the small intestine (alcohol-involved gastritis).
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Alcohol can cause malnutrition
Alcohol consumption can lead to malnutrition and anaemia. Alcohol abuse creates an internal environment that predisposes individuals to malnutrition. Alcohol is a toxin that must be processed by the liver, a process that uses up essential vitamins such as niacin, thiamine (vitamin B1) and other B vitamins. This means these vitamins are not available for other essential purposes. Alcohol also interferes with the absorption and storage of vitamins B12, folacin, and vitamin A.
Alcohol can trigger the release of large doses of vitamin A into the bloodstream, causing a slight, temporary sharpness of vision followed by night blindness. As alcohol is a diuretic, it increases urine output, leading to the loss of water-soluble minerals such as zinc, magnesium, and potassium. Zinc deficiency, in particular, can interfere with the ability to taste and smell, further limiting dietary intake.
Alcohol abuse also affects the nutritional process and heavy drinkers often eat poorly, which can lead to deficiencies in calcium, magnesium, iron, and zinc. Alcohol irritates the gastrointestinal system, increasing acid secretion by the stomach, which can injure the small intestine and interfere with the absorption of nutrients.
Alcohol is a high-calorie substance, with around 7kCal/g, compared to 4 kCal/g in carbohydrates and 9 kCal/g in fat. Heavy alcohol consumption can therefore displace calories from more nutritious sources. Studies have shown that moderate alcohol intake is associated with a slightly increased total energy intake, with alcohol often displacing calories from carbohydrates in the diet. However, in patients who consume more than 30% of their total calories from alcohol, the intake of proteins, fats, and carbohydrates is significantly reduced.
Malnutrition is common in alcohol-associated liver disease (ALD). A 1984 study of 363 US veterans characterized malnutrition in patients with alcohol-associated hepatitis (AAH). A later study by the same authors in 1986 found increased 30-day mortality in patients with severe versus mild protein-calorie malnutrition.
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Alcohol can lead to liver damage
Alcoholic beverages are indeed linked to several health issues, with the liver being particularly susceptible to damage. Alcohol is directly toxic to the liver, and its metabolism also produces byproducts that are harmful to this vital organ. When the liver metabolises alcohol, it creates acetaldehyde, a chemical that damages DNA and prevents the body from repairing this harm. This is why alcohol consumption is associated with an increased risk of at least six types of cancer, including liver cancer.
The liver has an impressive capacity for regeneration, but excessive alcohol consumption can overwhelm it, causing it to reach a "tipping point". At this stage, the liver becomes susceptible to acute alcohol-related hepatitis, a severe condition with a high mortality rate. Alcoholic hepatitis is characterised by inflammation, swelling, and the destruction of liver cells, which causes scarring (fibrosis). This condition can develop suddenly, typically after a period of heavy binge drinking, or it may progress slowly over time. Symptoms include jaundice, fever, nausea, vomiting, and abdominal pain.
Up to 35% of heavy drinkers develop alcoholic hepatitis, and 70% of these cases will progress to cirrhosis if alcohol consumption continues. Cirrhosis is a serious condition where scar tissue replaces most liver cells, causing the organ to shrink and harden. It is largely irreversible and can lead to fatal liver failure. Between 10% and 20% of heavy drinkers develop cirrhosis, usually after a decade or more of excessive alcohol consumption.
Abstinence from alcohol is critical to preventing and treating alcohol-associated liver damage. Even a single drink can be detrimental to those with alcohol-related liver disease. While some cases of alcoholic hepatitis can be reversed by refraining from alcohol, cirrhosis is often irreversible. Therefore, stopping alcohol consumption before reaching the "tipping point" is crucial for preserving liver health.
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Frequently asked questions
Alcohol has an impact on nutrition and food absorption. The energy in alcoholic drinks represents "empty calories", meaning they are high in kilojoules but do not deliver any nutritional benefit. Alcohol can also alter the intake, absorption, and utilization of various nutrients, leading to malnutrition and deficiencies in amino acids, proteins, and certain vitamins.
Alcoholic drinks are high in kilojoules, which can contribute to weight gain and obesity. However, these drinks do not provide any nutritional benefits, hence the term "empty calories".
Alcohol interferes with the normal metabolism of other nutrients, particularly lipids, and contributes to liver cell damage. Alcohol also damages the organs involved in digesting, absorbing, and processing nutrients.
Chronic drinkers often show evidence of malnutrition, including deficits in amino acids, proteins, and certain vitamins, particularly vitamin A.
Yes, nutritional approaches can help prevent or improve alcoholic liver disease. A complete balanced diet can compensate for general malnutrition, and administration of antioxidants can help eliminate reactive oxygen molecules generated from abnormal lipid breakdown.
