Eating Before: The Most Useful Window
Food eaten before or during drinking has a significant effect on how the night goes and how you feel in the morning. A substantial meal with protein, fat and carbohydrates slows alcohol absorption — it keeps food in the stomach that alcohol has to pass through before entering the small intestine where absorption is fastest. This smooths the peak blood alcohol curve, reduces how drunk you get per drink, and reduces the total acetaldehyde burden.
The optimal timing is 30-90 minutes before drinking begins. The closer to drinking with no food in the stomach, the less benefit.
Eating After Drinking: Limited Prevention Benefit
Food eaten after drinking — the late-night kebab or pizza — does little to prevent a hangover. The alcohol is already largely absorbed. It may slow continued absorption slightly if you're still drinking, but as a hangover prevention strategy, the window has largely closed.
The Morning-After Breakfast
Breakfast after drinking is genuinely helpful — not as a "cure" but for specific symptoms. Blood sugar drops overnight as alcohol inhibits gluconeogenesis. A breakfast with carbohydrates restores blood sugar and reduces fatigue, shakiness and difficulty concentrating. Protein helps with ongoing recovery. This is real and worth doing — but it's recovery management, not prevention.
The Greasy Food Myth
The greasy breakfast myth comes from the idea that fat "absorbs" or "lines" the stomach. This isn't quite how it works. Fat slows gastric emptying, which slows alcohol absorption — but only if you eat it before drinking. A greasy breakfast the morning after doesn't coat anything or absorb alcohol that's already been processed. It may feel comforting but the effect is psychological rather than biochemical.