Intermittent fasting has surged in popularity for its potential health perks, including weight loss, enhanced fat burning, and lowered inflammation (1).
This eating approach alternates periods of fasting with periods of eating. Unlike many conventional diets, it doesn’t forbid specific foods during eating windows.
Still, you might be curious whether drinking alcohol reduces the advantages associated with intermittent fasting.
This piece explores how alcohol interacts with intermittent fasting and assesses whether some beverages are preferable to others.
Alcohol can hinder fat oxidation
Intermittent fasting may enhance fat oxidation, thereby lowering body fat percentage (2).
However, consuming alcohol has been shown to impair the breakdown of fat.
In one trial involving 19 adults, a meal containing alcohol produced markedly reduced fat breakdown 5 hours after consumption compared with a meal high in protein, fat, and carbohydrates (3).
Alcohol can also promote overeating, which over time may contribute to weight gain (4).
Observational research links heavy alcohol use to greater body fat; this association is not evident among light to moderate drinkers (5, 6).
Additional studies are necessary to fully clarify alcohol’s effects on body weight.
Summary: Alcohol consumption may reduce fat oxidation. While heavy drinking can raise body fat percentage, light to moderate drinking does not show the same pattern.
Alcohol’s link to weight gain
Many people try intermittent fasting primarily to lose weight.
Alcohol is energy-dense: each gram yields about 7 calories. A single drink can add 100 or more calories to your daily total (7).
That said, findings are mixed on whether alcohol consumption leads to weight gain (5, 7).
Indeed, several observational studies suggest moderate drinking may be associated with a lower risk of gaining weight (5, 8, 9).
Conversely, heavy drinking—often defined as 4+ drinks per day for men and 3+ per day for women—is associated with a higher risk of weight gain and obesity (5, 9, 10).
Summary: Although alcohol packs many calories, moderate consumption might lower the risk of weight gain, while excessive intake increases that risk.
Excess drinking may drive inflammation
Intermittent fasting has been reported to decrease inflammation in the body.
Nonetheless, alcohol can provoke inflammatory responses, potentially negating some benefits of the fasting pattern (1).
Persistent inflammation is implicated in many diseases, including cardiovascular disease, type 2 diabetes, and some cancers (11).
Evidence indicates that inflammation from heavy drinking may lead to increased intestinal permeability, bacterial overgrowth, and disturbances in gut microbiota (12, 13, 14).
High levels of alcohol can also overload the liver, impairing its capacity to detoxify harmful substances (14, 15).
Combined, these impacts on the gut and liver may fuel systemic inflammation and, over time, contribute to organ damage (15).
Summary: Excessive alcohol use can trigger widespread inflammation, undermining the anti-inflammatory effects of intermittent fasting and increasing disease risk.
Alcohol will break a fast
Fasting periods are intended to exclude foods and caloric beverages for a set duration.
Intermittent fasting aims to induce hormonal and metabolic shifts—such as increased fat burning and cellular repair—that may be beneficial.
Because alcohol contains calories, any amount consumed during a fasting window technically ends the fast.
That said, drinking in moderation is acceptable during your designated eating windows.
Alcohol may interfere with cellular cleanup
While fasting, your body activates cellular maintenance mechanisms like autophagy, where damaged proteins and components are recycled to form healthier cells (16).
Autophagy may lower cancer risk, support anti-aging effects, and help explain why caloric restriction has been linked to longer lifespan (16, 17).
Recent animal work suggests chronic alcohol consumption can suppress autophagy in liver and adipose tissue, though human data are still needed (18, 19).
Summary: Because alcohol has calories, drinking during a fasting window breaks your fast and could hinder cellular repair processes like autophagy.
Picking better alcoholic options
Since alcohol terminates a fast if consumed during fasting intervals, it’s advisable to limit drinking to your eating periods (20).
Also keep intake moderate: guidelines define moderate drinking as up to 1 drink per day for women and up to 2 per day for men (21).
While intermittent fasting doesn’t strictly regulate which foods or drinks are allowed, some alcoholic choices are healthier and less likely to undermine your plan.
Lower-calorie choices include dry wines and distilled spirits, which can be enjoyed straight or with soda water.
To reduce added sugar and calories, avoid sugary mixed cocktails and sweet wines.
Summary: When following intermittent fasting, drink only during eating windows and in moderation. Better choices include dry wines and distilled spirits.
The bottom line
If you drink moderately and only within your eating windows, alcohol is unlikely to derail intermittent fasting.
However, alcohol is calorie-rich and may hinder fat oxidation. Heavy drinking can also fuel chronic inflammation and other health problems.
To minimize surplus calories and sugar, opt for dry wine or spirits instead of sugary mixed drinks.
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