Is Alcohol Your Weight Loss Kryptonite?

alcohol weight lossAccording to conventional wisdom, the infamous “beer belly” is caused by the calories from alcohol being stored as fat.

There are also plenty of people who avoid alcohol in the same way that Superman avoids Kryptonite, worried that even a few drinks will bring weight loss grinding to a halt.

Can you go out on a Friday and Saturday night, enjoy a few drinks AND lose weight at the same time? Or is living like a monk the only way to get the body you want?

Alcohol is labeled as containing 7.1 calories per gram. But the real value is slightly lower. That’s because alcohol elicits a thermogenic response, which means it raises your metabolic rate for some time after you drink it.

Once this rise in metabolism is taken into account, which is larger than the rise seen with carbohydrate or fat, the “true” number of calories in a gram of alcohol is around 6 calories [1].

Whether or not alcohol is “fattening” is a very controversial subject, mainly because the main fate of alcohol is NOT to be stored as fat. In fact, less than 5% of the alcohol you drink is turned into fat. Rather, the main effect of alcohol is to reduce the amount of fat your body burns for energy.

In fact, just two drinks of vodka and sugar-free lemonade, with each drink containing just under 90 calories, has been shown to cut whole body lipid oxidation (a measure of how much fat your body is burning) by more than 70% [2].

You can see this for yourself in the figure below, which shows fat burning before (on the left) and after (on the right) alcohol consumption.
Fat oxidation before and after ethanol consumptionRather than getting stored as fat, the main fate of alcohol is conversion into a substance called acetate. In fact, blood levels of acetate after drinking the vodka were 2.5 times higher than normal. And it’s this sharp rise in acetate that puts the brakes on fat loss.

To summarize and review, here’s what happens to fat metabolism after drinking alcohol:

  1. A small portion of the alcohol is converted into fat. Of the 24 grams of alcohol consumed in this study, roughly 3% was turned into fat.
  2. Your liver then converts most of the alcohol into acetate.
  3. The acetate is released into your bloodstream and takes precedence over the metabolism of protein, carbohydrate, and fat.

The way your body responds to alcohol is very similar to the way it deals with excess carbohydrate. Although carbohydrate can be converted directly into fat, this doesn’t happen unless you’re eating large amounts of it.

Instead, one of the main effects of overfeeding with carbohydrate is that it simply replaces fat as a source of energy. By suppressing fat burning, it enables the fat in your diet to be stored a lot more easily.

It’s important to point out that alcohol is only having this effect while it’s being metabolized by your body.

When researchers have looked at the effect of alcohol calories over an entire day, rather than just for a few hours, they find that alcohol increases fat storage only when you take in more calories than you burn off [3].

The reason that alcohol has such a bad reputation when it comes to weight loss has a lot to do with the fact that it acts as a potent appetizer [4]. In other words, you’ll eat more food if a meal is served with an alcoholic drink than you would if that same meal was served with a soft drink [5].

So you get hit twice — once from the calories in the alcoholic drink, and then again from the subsequent increase in appetite and calorie intake.

You can drink alcohol and still lose weight, just as long as you’re sensible about it.

In one German study, 49 overweight subjects were assigned to one of two 1500-calorie diets [6]. The first diet included a glass of white wine every day and the other a glass of grape juice.

After three months, the wine group ended up losing slightly more weight — 10.4 pounds versus 8.3 pounds in the grape juice group — although this wasn’t a statistically significant difference.

Obviously there’s a balance to be struck. You don’t need to cut alcohol out completely. But if you’re trying to lose weight, cutting your intake in half is a good place to start.

The simple way to do this is alternate whatever you’re drinking with water or some other low-calorie drink. So you’d have a cocktail… then a glass of water… then a cocktail… and so on. If you drink a glass or two of wine every night, try drinking every other night instead.

In summary, the idea that alcohol automatically turns into fat and goes straight to your waist is mistaken. Alcohol does put the brakes on fat burning while it’s being metabolized by your body. But it’s no more likely to stop you losing weight than excess calories from carbohydrate or fat.


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It's a straight-to-the-point PDF, written in plain English, that tells you exactly how to get rid of belly fat. To download a free copy, please click or tap here.

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Christian FinnChristian Finn holds a master's degree with distinction in exercise science, is a former personal trainer and has been featured on BBC TV and radio, as well as in Men's Health, Men's Fitness, Fit Pro, Zest, and Perfect Body magazine.

1. Schutz Y. (2000). Role of substrate utilization and thermogenesis on body-weight control with particular reference to alcohol. Proceedings of the Nutrition Society, 59, 511-517
2. Siler SQ, Neese RA, Hellerstein MK. (1999). De novo lipogenesis, lipid kinetics, and whole-body lipid balances in humans after acute alcohol consumption. American Journal of Clinical Nutrition, 70, 928-936
3. Sonko BJ, Prentice AM, Murgatroyd PR, Goldberg GR, van de Ven ML, Coward WA. (1994). Effect of alcohol on postmeal fat storage. American Journal of Clinical Nutrition, 59, 619-625
4. Tremblay A, St-Pierre S. (1996). The hyperphagic effect of a high-fat diet and alcohol intake persists after control for energy density. American Journal of Clinical Nutrition, 63, 479-482
5. Buemann B, Toubro S, Astrup A. (2002).The effect of wine or beer versus a carbonated soft drink, served at a meal, on ad libitum energy intake. International Journal of Obesity and Related Metabolic Disorders, 26, 1367-1372
6. Flechtner-Mors M, Biesalski HK, Jenkinson CP, Adler G, Ditschuneit HH. (2004). Effects of moderate consumption of white wine on weight loss in overweight and obese subjects. International Journal of Obesity and Related Metabolic Disorders, 28, 1420-1426