How could diet affect hangover?

Despite the commonly-held belief that eating bread or greasy food will help to prevent a hangover by “soaking up” the alcohol, there’s no scientific evidence to support this effect. However, eating food (especially high-energy meals) before or during a drinking episode will help to mitigate the rate and magnitude of the rise in BAC, decrease the absorption of alcohol, and slow the metabolism of alcohol — leading to less intoxication and perhaps a less-severe hangover. Dietary intake of nicotinic acid and zinc is known to play a role in the metabolism of alcohol (ethanol) into acetaldehyde. Studies have found that social drinkers with higher intakes of zinc and nicotinic acid have a lower hangover severity. The intakes of other nutrients, including fat, carbohydrates, protein, fiber, salt, or vitamins B, D, C, and E, are not associated with hangover severity.^[1]