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Drinking alcohol increases appetite for savory food—but needn’t necessarily lead to weight gain, new research presented at the International Congress on Obesity in Melbourne indicates.

Alcohol is energy dense but the evidence that it contributes to weight gain is inconclusive. One reason for this may be that research to date has typically looked at the effect of alcohol in isolation, rather than in conjunction with other dietary components.

To find out more, Dr. Amanda Grech, of The University of Sydney, Australia and colleagues examined how alcohol affects the appetite for different types of food and the subsequent calorie intake.

“It’s known that alcohol increases appetite, particularly for savory food, a phenomenon that’s known as the ‘aperitif effect,'” says Dr. Grech, zanaflex lunesta lead author of the study.

“Recent research has shown that levels of FGF-21, a hormone that increases protein appetite and suppresses appetite for sweetness, increase after alcohol is consumed.

“It’s also known that protein has a satiating effect. We wanted to find out whether people select more protein-rich savory foods when drinking alcohol and, if they do, whether the satiating effect of additional dietary protein leads to them taking in fewer calories overall, despite the additional energy from alcohol itself.”

Dr. Grech analyzed data on 9,341 adults who took part in the Australian National Nutrition and Physical Activity Survey, the largest and most comprehensive health survey ever conducted in Australia. The team used an approach called nutritional geometry, which was invented by team members Professors David Raubenheimer and Stephen Simpson, to detect complex nutritional associations in diets. It untangles the multi-dimensionality of diet as when one nutrient changes, other nutrients change as a consequence. The approach allows multiple components to be observed at the same time and to observe how nutrients interact.

The data included information on the food and drink each participant had consumed over a 24-hour period, the total amount of energy consumed during that period and how much of that energy came from protein, fat, carbohydrate and other nutrients. 40% of the participants had consumed alcohol.

The analysis showed that, as expected, participants who had consumed alcohol consumed more savory foods than those who didn’t have any alcohol.

“Surprisingly,” says Professor David Raubenheimer, senior author of the study, “this was associated with decreased energy intake in some consumers of alcohol, but increased energy intake in others.”

Around two-thirds of those who consumed alcohol chose foods high in protein but low in carbohydrate and fat, such as lean meats, poultry, fish, seafood, nuts, legumes and other foods that are high in protein.

They consumed 1,749 kcal (calories), on average. The figure, which includes the calories from the alcohol they consumed, is 577 kcal fewer than they needed to maintain their current weight (known as EER or estimated energy requirement) and 451 kcal fewer than the 2,200 kcal consumed by the non-drinkers.

The other one-third of participants who consumed alcohol chose “protein decoys.” These are crisps, sausage rolls, processed meats, garlic bread, spring rolls, potato wedges and other savory snacks that have umami taste of high-protein foods but are, in fact, low in protein and high in fat.

They consumed 3,051 kcal on average. This is meant they were taking in more calories (813 kcal) more than their EER which, over time, can lead to weight gain.

The researchers conclude that although alcohol is energy dense, drinking it need not necessarily lead to weight gain.

However, in the current obesogenic food environment, low-protein, high-fat snack foods are abundant and inexpensive, and so alcohol may indeed be contributing to the obesity epidemic.

Dr. Grech adds, “When consuming alcohol and your appetite is elevated, make sure you select healthier lean protein sources such as lean red meat, chicken, fish, seafood or legumes and avoid the urge to snack on low-protein, savory snack foods.

“This will ensure that your protein appetite is satisfied without over consuming energy, leading to weight gain.

“Above all, be sure to stick within the guidelines for alcohol intake, which poses health risks other than weight gain and obesity.”

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