Lena Savoie
Alcohol's relationship with weight gain and metabolism is a complex topic that has been studied extensively. Alcohol is a toxin that contains seven calories per gram, but the body does not efficiently metabolize all of these calories. The body prioritizes breaking down alcohol over other calories, and the metabolism of alcohol occurs mainly in the liver and kidneys, not the intestines. This process can lead to the storage of fat from recently eaten food. While moderate drinking may not significantly impact weight, chronic heavy drinking can prime metabolic processes to waste the calories from alcohol, and frequent drinking may lead to obesity.
| Characteristics | Values |
|---|---|
| Calories in alcohol | 7kcal/gram |
| Calories in a pint of beer | 200kcal |
| Calories in alcohol metabolized | Alcohol is almost never fully metabolized |
| Effect of alcohol on metabolism | Slows down metabolism |
| Effect of alcohol on weight gain | Alcohol calories can add up and cause weight gain |
| Effect of alcohol on sleep | Disrupts sleep cycle |
| Effect of alcohol on brain | Inhibits the brain's ability to learn and retain information |
| Effect of alcohol on nutrition | Inhibits the absorption of vital nutrients such as vitamins and minerals |
| Effect of alcohol on muscle growth | Impedes muscle growth and repair |
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What You'll Learn
Alcohol is a toxin, which slows metabolism
Alcohol is a toxin that must be neutralized or eliminated from the body. The liver is the primary organ responsible for the detoxification of alcohol. The body does not store calories from alcohol, but it does contain calories. These calories are used by the body, and the excess energy is stored in fat cells.
Alcohol is metabolized by several processes or pathways. The most common of these pathways involves two enzymes—alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH). These enzymes help break apart the alcohol molecule, making it possible to eliminate it from the body. ADH metabolizes alcohol to acetaldehyde, a highly toxic substance and known carcinogen. Then, acetaldehyde is further metabolized by ALDH to another, less active byproduct called acetate, which is then broken down into water and carbon dioxide for easy elimination.
The rate of detoxification of alcohol from the body is about 0.015 g/100mL/hour, which is the same as reducing your BAC level by 0.015 per hour. Nothing will speed up the rate of detoxification, but the effective metabolism of alcohol can be limited by medications and liver damage. When the rate of consumption exceeds the rate of detoxification, BAC will continue to rise.
Alcohol can also affect the metabolism of certain medications, speeding up or slowing down the clearance of the medication from the body. This altered metabolism lowers or raises levels of the medication in the blood, increasing or decreasing the medication's effects on the body.
Chronic heavy drinking can prime certain metabolic processes and, in effect, train the body to waste the calories a gram of alcohol ordinarily provides. For example, weight gain was negligible in alcoholics who were given 2,000 calories of alcohol daily on top of the 2,500 calories from foods they consumed to maintain their weight.
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Alcohol calories are not converted to glycogen
Alcohol calories are often referred to as ""empty calories"" because they contain no nutritional value. When alcohol is consumed, its metabolism takes priority over other macronutrients such as fat, carbohydrates, and proteins. This is because the metabolic by-product of alcohol, known as acetate or acetyl coenzyme A (CoA), is toxic to the body, and the body prioritizes removing these toxins. Acetate is produced by the oxidation of ethanol, which can occur in the stomach or the liver.
Once alcohol is converted into acetate in the liver, only a small portion can be converted into fatty acids. The rest is circulated to peripheral tissues, where it is activated into acetyl CoA. Acetyl CoA is also produced from the oxidation of carbohydrates, fats, and excess proteins. Thus, the carbon atoms from alcohol are converted into the same products as those derived from the oxidation of these macronutrients, including CO2, fatty acids, and ketone bodies.
However, the presence of alcohol suppresses the oxidation of fat, carbohydrates, and proteins. One study found that an alcohol-rich meal suppressed fat oxidation more than a carbohydrate-rich meal. This may be because alcohol interferes with the substrate hierarchy, in which carbohydrates are metabolised first, causing insulin levels to rise and fat oxidation to be suppressed. When insulin levels drop, fat is released from fat cells for metabolism. Thus, alcohol may disrupt the normal metabolism of macronutrients and contribute to weight gain.
Chronic heavy drinking can prime certain metabolic processes and train the body to waste the calories provided by alcohol. For example, weight gain was negligible in alcoholics who were given 2,000 calories of alcohol daily in addition to their regular diet. However, when the same number of additional calories was given as chocolate, a steady weight gain was observed. This suggests that the body may not fully absorb all the calories from alcohol, especially in the case of heavy drinkers.
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Alcohol affects sleep, reducing HGH
Alcohol affects sleep and reduces the production of the human growth hormone (HGH). Even one glass of alcohol in the evening can decrease growth hormone secretion during sleep by as much as 63%, with a second glass pushing that number up to 81%. HGH is a crucial part of the muscle-building and repair process, as it is the body's way of telling itself that muscles need to grow bigger and stronger.
Alcohol also reduces energy sources by inhibiting a process known as gluconeogenesis, in which glucose is formed from non-glucose substances. When alcohol is oxidized by the enzyme alcohol dehydrogenase, it produces an elevation of NADH, which ultimately reduces the amount of a coenzyme that is essential in the production of ATP. This loss of ATP results in a lack of energy and endurance.
Additionally, alcohol can disrupt the water balance in muscle cells, altering their ability to produce adenosine triphosphate (ATP), which is the primary source of energy for muscles. This disruption can lead to a decrease in muscle mass and strength. Furthermore, alcohol consumption can negatively impact sleep cycles, even when consumed up to six hours before bedtime. It can also affect brain and body activities for several days after drinking, hindering the consolidation of newly learned information.
Chronic heavy drinking can prime certain metabolic processes, effectively training the body to waste the calories that alcohol ordinarily provides. This may explain why heavy drinkers and alcoholics often lose weight despite consuming a significant number of extra calories from alcohol. However, it is important to note that alcohol cannot be stored by the body and must be metabolized, which can impact weight gain.
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Alcohol impairs memory formation
Alcohol has been found to impair memory formation in several ways. Firstly, it inhibits nerve activity, which can lead to short-term memory loss. This is due to the toxic effects of alcohol on the hippocampus, a part of the brain that is crucial for forming and storing new memories. The hippocampus is also responsible for memory consolidation and processing, and when its function is impaired, it can result in blackouts or gaps in memory during periods of acute intoxication.
Additionally, alcohol acts on the central nervous system by altering the functioning of GABA receptors, specifically GABAA subtypes. This alteration leads to a decrease in the likelihood of action potentials occurring, resulting in an inhibitory effect on neurotransmission. These changes affect synaptic plasticity and, consequently, memory and learning abilities. Alcohol also impairs the functioning of the cerebellum, which is responsible for motor function and coordination.
The effects of alcohol on memory can manifest in both the short and long term. Short-term memory loss can occur during or after a period of heavy drinking, resulting in an inability to recall specific events or conversations. Long-term memory loss is associated with chronic, heavy alcohol use and can lead to a persistent decline in memory and cognitive skills, potentially progressing to dementia.
Older individuals are particularly vulnerable to the effects of alcohol on memory. Alcohol increases the risk of falls due to impaired judgment and perception, and injuries from these falls can further impact memory function. Additionally, malnutrition and vitamin B1 (thiamine) deficiency associated with excessive alcohol consumption can contribute to Wernicke-Korsakoff syndrome (WKS), a type of dementia characterized by memory decline and other neurological symptoms.
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Alcohol affects weight gain
The impact of alcohol on weight gain is influenced by drinking patterns. Chronic heavy drinking can train the body to waste the calories provided by alcohol, resulting in negligible weight gain solely from alcohol consumption. However, when the same number of additional calories are consumed from other sources, such as chocolate, steady weight gain occurs. This phenomenon was observed in alcoholics who maintained their weight with 2,500 calories from food and did not gain weight significantly when an additional 2,000 calories of alcohol were introduced.
Drinking alcohol also affects eating habits and metabolism. Alcohol increases appetite and impairs the prefrontal cortex, leading to a loss of inhibitions and potentially resulting in overeating. It also presses "pause" on metabolism, prioritizing the breakdown of alcohol calories over food calories, which can cause the recently eaten food to be stored as fat.
Additionally, alcohol disrupts sleep patterns, reducing the body's ability to repair and build muscle. It decreases the secretion of human growth hormone (HGH) by up to 70%, hindering muscle growth and repair processes that occur during sleep.
While alcohol may not directly contribute to weight gain in the same way as calories from other sources, it indirectly affects weight gain through various physiological mechanisms and behavioral changes.
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Frequently asked questions
Yes, alcohol contains seven calories per gram. However, research suggests that the body only extracts 70-80% of this due to thermogenesis, resulting in approximately 5-6 calories per gram of alcohol being utilized.
No, alcohol is almost never fully metabolized by the body. Alcohol is a toxin, and our bodies actively work to excrete it. It is excreted as acetic acid, and the liver can only process so much alcohol as energy before the body starts eliminating the excess as urine.
The relationship between alcohol consumption and weight gain is complex and remains the subject of inconclusive studies. Some research suggests that moderate drinking may be associated with lower weight gain over time, while chronic heavy drinking can prime certain metabolic processes and train the body to waste the calories from alcohol. Additionally, drinking alcohol can increase appetite and cravings for calorie-dense foods, contributing to weight gain.
