Alcohol
I not a big drinker and never have been but did used to have an occasional beer with a meal. Where I used to be able to drink a bottle now the most I can drink now is about 6 oz, and that I have to nurse through out the meal. Yet, although I'm still a big guy, it hits me like a ton of bricks! I have to wait a little before I drive, even though at the most is only 6 oz of beer inside of me? Maybe because our tummies are 90% smaller, the alcohol is absorbs into our bloodstream faster? I don't know. Yet, also the beer appears to evaporate from me just as fast as well. So while admittedly I do not know how this works, I do know I cannot drink much alcohol and when I do-I FEEL IT!!